[Janus Letterhead]



December 28, 2007

VIA EDGAR

Mr. Larry Greene
Division of Investment Management
U.S. Securities and Exchange Commission
100 F Street, N.E.
Washington, DC  20549-0505

Re:      JANUS ADVISER SERIES (the "Registrant")
         1933 Act File No. 333-33978
         1940 Act File No. 811-09885
         Post-Effective Amendment No. 41

Dear Mr. Greene:

On behalf of the Registrant and its funds (each, a "Fund" and collectively, the
"Funds"), this letter is to respond to your comments made by telephone on
November 14, 2007 with respect to the Registrant's Post-Effective Amendment No.
41 filed pursuant to Rule 485(a) under the Securities Act of 1933 (the "1933
Act") on September 14, 2007. The Staff of the Securities and Exchange
Commission's (the "Staff") comments and the Registrant's responses to Staff
comments are as follows:

1.       COMMENT: The Staff requests that the Registrant reflect in writing all
         comments and responses and carry over comments, as applicable, to the
         Registrant's other Prospectuses and Statements of Additional
         Information ("SAIs").

         RESPONSE: The Registrant acknowledges the comment and confirms that it
         has complied.

Growth & Core Funds ~ Class A Shares and Class C Shares Prospectus

2.       COMMENT: The Staff requested confirmation that in cases where funds'
         names describe security capitalization (i.e. "Large Cap"), the
         Registrant provides disclosure of capitalization ranges.

         RESPONSE: The Registrant confirms that in cases where fund names
         describe security capitalization, the Registrant provides disclosure of
         capitalization ranges.

3.       COMMENT: With respect to the "Securities Lending Risk" reflected in the
         Prospectus, the Staff asked whether or not the securities lending agent
         was affiliated with the Registrant and is a part of a lending program.
         If the lending agent is affiliated, the Staff asks that the Registrant
         include additional information about the affiliation and fees paid to
         the agent. In addition the Staff asked what would cause a "leveraging
         effect" for a fund engaging in securities lending.

         RESPONSE: The Registrant confirmed that the Registrant participates in
         a securities lending program but with an unaffiliated lending agent. A
         leveraging effect may occur during securities lending because of the
         lending Fund's ability to use proceeds and collateral to purchase other
         securities.







4.       COMMENT: With respect to Janus Adviser Growth and Income Fund, what
         does disclosure concerning "other securities with equity
         characteristics (including the use of swaps)" mean?

         RESPONSE: As discussed, the disclosure, which lists equity securities
         in which the Fund may invest, also includes the concept that other
         securities may be identified which have equity characteristics. These
         securities may include swaps, which provide exposure to the equity
         market.

5.       COMMENT: With respect to Janus Adviser Growth and Income Fund, the
         Staff asked if the Fund had a large, single country emerging markets
         investment and, if so, indicated that the percentage of any country
         concentration should be disclosed in the prospectus.

         RESPONSE: In response to prior Staff comment regarding emerging markets
         disclosure, the Registrant has included the specific percentage of
         emerging markets allocation as of a Fund's fiscal year end, as
         applicable. The Registrant believes that specific country allocation is
         more appropriate in shareholder reports and Form N-Q. As previously
         discussed with and agreed to by the Staff, disclosure was previously
         added directing investors to shareholder reports and Form N-Q for a
         summary of investments by country.

6.       COMMENT: The Staff suggests that the footnotes to the Fees and Expenses
         table follow the expense examples.

         RESPONSE: The Registrant believes that the most effective presentation
         of the information is reflected in the current disclosure and is
         consistent with Item 3 of Form N-1A. Additionally, General Instruction
         C.1(a) to Form N-1A provides that a fund should use document design
         techniques that promote effective communication which the Registrant
         believes is consistent with its current disclosure.

7.       COMMENT: The Staff stated that the performance fee structure is more
         properly characterized as a fixed-rate that is adjusted rather than a
         "rate that adjusts up or down."

         RESPONSE: The disclosure, which was also contained in the proxies
         provided to shareholders, does in fact indicate that the fee is
         calculated by applying a fixed-rate advisory fee plus or minus a
         performance fee adjustment.

8.       COMMENT: With respect to the footnote to the "Fees and Expenses" table
         pertaining to contractual expense waivers, the Staff questioned what
         type of dividends are contemplated in the exclusions.

         RESPONSE: As discussed during our call, the reference pertains to
         dividends on short sales.

9.       COMMENT: The Staff commented that if the Funds' disclosure stating
         "Within the parameters of its specific investment policies, each Fund
         may invest in foreign securities..." allows the Funds to invest in
         emerging markets, the Registrant should add emerging markets to the
         discussion.

         RESPONSE: As discussed during our call, the corresponding emerging
         markets discussion is on the page following the foreign securities
         discussion.






Alternative Funds ~ Class A Shares and Class C Shares Prospectus

10.      COMMENT: With respect to Janus Adviser Long/Short Fund, the Staff asked
         whether, under section titled "Performance Information," the statement
         "Performance information for certain periods is included in the Fund's
         first annual and/or semiannual report" was true.

         RESPONSE: The Registrant confirms that performance information for the
         period following the Fund's effective date (August 1, 2006) is
         reflected in the Fund's annual and semiannual reports.

11.      COMMENT: With respect to Janus Adviser Global Real Estate Fund, the
         Staff notes that in the cases of funds with global, international,
         foreign, or worldwide in their names, such funds should each invest in
         securities of at least ten countries and have invested at least 40% of
         its assets in securities of foreign countries, excluding the U.S.

         RESPONSE: Consistent with investment policies and restrictions of the
         Fund, the Registrant has previously added or revised disclosure as
         appropriate to reflect that such funds invest in several countries. The
         Registrant believes its investment policies are consistent with formal
         SEC guidance.

12.      COMMENT: With respect to Janus Adviser Global Real Estate Fund, the
         Staff noted that having "Real Estate" in the Fund's name makes the Fund
         subject to the Fund Names Rule.

         RESPONSE: The Registrant confirms that the Fund's investment strategy
         is consistent with the adopting release for Rule 35d-1.

13.      COMMENT: As it applies to the Fund Names Rule, the Staff asked the
         Registrant to explain how the Fund defines real estate.

         RESPONSE: In its disclosure, the Registrant indicates that the Fund
         invests at least 80% of its net assets in equity and debt securities of
         "real estate-related companies." Real estate-related companies include
         (1) companies that are typically classified as being in the real estate
         industry and (2) companies that are in real estate-related industries.
         Real estate-related industries include companies that generally (i)
         derive at least 50% of their revenue from ownership, construction,
         extraction financing, management, operation, sales or development of
         real estate, or from businesses which have a clear relationship to
         these activities; (ii) have at least 50% of their assets in real
         estate; or (iii) have more than 50% of their net asset value accounted
         for by real estate.

14.      COMMENT: With respect to Janus Adviser Global Real Estate Fund, the
         Staff asked whether or not there is specific disclosure related to the
         risks associated with subprime mortgage investments and the current
         real estate market.

         RESPONSE: The Registrant has included additional risk disclosure
         associated with investments in mortgage-backed securities comprised of
         subprime mortgages and general market deterioration.

15.      COMMENT: The Staff stated its view that Rule 13a-1 under the Investment
         Company Act of 1940 is intended to apply to non-diversified funds which
         temporarily become diversified, not non-diversified funds which
         normally operate as diversified funds. The disclosure should accurately
         reflect Janus Adviser Global Real Estate Fund's subclassification.

         RESPONSE: Item 2 of Form N-1A indicates that a Fund classified as
         non-diversified include disclosure that it "may" invest a larger
         portion of its assets in fewer issuers. The Registrant believes its
         disclosure is consistent with Form N-1A.







16.      COMMENT: The Staff suggests that the footnotes to the "Fees and
         Expenses" table follow the expense examples.

         RESPONSE: The Registrant believes that the most effective presentation
         of the information is reflected in the current disclosure and is
         consistent with Item 3 of Form N-1A. Additionally, General Instruction
         C.1(a) to Form N-1A provides that a fund should use document design
         techniques that promote effective communication which the Registrant
         believes is consistent with its current disclosure.

17.      COMMENT: With respect to Janus Adviser Long/Short Fund, the Staff
         indicated that it may request, in future reviews, additional disclosure
         regarding expense recoupment by Janus Capital permitted pursuant to an
         expense limitation agreement between the Registrant and Janus Capital.

         RESPONSE: The Registrant confirms that the Fund has the ability to
         recoup certain expenses as described in the Fund's expense limitation
         agreement. As previously discussed, the contractual expense waivers
         apply if total operating expenses (excluding certain expenses) exceed a
         certain limit, and recoupment is only possible if the expense ratio
         falls below the expense limit, and only for a period of three years
         subsequent to the Fund's commencement of operations.

18.      COMMENT: The Staff noted that the term "junk bonds" should be added in
         association with the term "non-investment grade bonds."

         RESPONSE: The Registrant acknowledges the comment and confirms that it
         has complied.

19.      COMMENT: The Staff commented that it is necessary to discuss the risks
         of unsponsored depositary receipts in association with the Funds'
         investments in foreign securities.

         RESPONSE: The risks of unsponsored American Depositary Receipts are
         discussed in the SAI under "Depositary Receipts."

Risk-Managed Funds ~ Class A Shares and Class C Shares Prospectus

20.      COMMENT: With respect to Janus Adviser INTECH Risk-Managed
         International Fund, the Staff notes that in the cases of funds with
         global, international, foreign, or worldwide in their names, such funds
         should each invest in securities of at least ten countries and have
         invested at least 40% of its assets in securities of foreign countries,
         excluding the U.S.

         RESPONSE: Consistent with investment policies and restrictions of the
         Fund, the Registrant has previously added or revised disclosure as
         appropriate to reflect that such funds invest in several countries. The
         Registrant believes its investment policies are consistent with formal
         SEC guidance.

21.      COMMENT: The Staff suggests that the footnotes to the "Fees and
         Expenses" table follow the expense examples.

         RESPONSE: The Registrant believes that the most effective presentation
         of the information is reflected in the current disclosure and is
         consistent with Item 3 of Form N-1A. Additionally, General Instruction
         C.1(a) to Form N-1A provides that a fund should use document design
         techniques that promote effective communication which the Registrant
         believes is consistent with its current disclosure.







22.      COMMENT: With respect to Janus Adviser INTECH Risk-Managed Value Fund
         and Janus Adviser INTECH Risk-Managed International Fund, the Staff
         indicated that it may request, in future reviews, additional disclosure
         regarding expense recoupment by Janus Capital permitted pursuant to an
         expense limitation agreement between the Registrant and Janus Capital.

         RESPONSE: The Registrant confirms that each Fund has the ability to
         recoup certain expenses as described in the Fund's expense limitation
         agreement. As previously discussed, the contractual expense waivers
         apply if total operating expenses (excluding certain expenses) exceed a
         certain limit, and recoupment is only possible if the expense ratio
         falls below the expense limit, and only for a period of three years
         subsequent to each Fund's commencement of operations.

23.      COMMENT: Clarify the sentence under "Special Situations" that states
         "INTECH's mathematical investment process may select companies that are
         deemed by the market to be a special situation only to the extent they
         are included in the Funds' respective benchmark index."

         RESPONSE: INTECH will only invest in special situation companies (i.e.,
         companies with significant business problems) if they are a part of the
         Funds' benchmark index.

International & Global Funds ~ Class A Shares and Class C Shares Prospectus

24.      COMMENT: With respect to each Fund, the Staff notes that in the cases
         of funds with global, international, foreign, or worldwide in their
         names, such funds should each invest in securities of at least ten
         countries and have invested at least 40% of its assets in securities of
         foreign countries, excluding the U.S.

         RESPONSE: Consistent with investment policies and restrictions of the
         Funds, the Registrant has previously added or revised disclosure as
         appropriate to reflect that such funds invest in several countries. The
         Registrant believes its investment policies are consistent with formal
         SEC guidance.

25.      COMMENT: With respect to Janus Adviser International Equity Fund and
         the disclosure stating "The Fund may invest in emerging markets, but
         will normally limit such investments to 15% of its net assets...," the
         Staff asked whether or not the investments could be illiquid, and if
         so, the Fund would need to take appropriate steps.

         RESPONSE: As discussed during the call, the Registrant confirms that
         should a security become illiquid and exceed the 15% guideline limit,
         it will take steps deemed appropriate by it or Janus Capital. The
         Registrant notes that the emerging market disclosure is not related to
         the 15% illiquid guideline.

26.      COMMENT: With respect to Janus Adviser Global Research Fund, the Staff
         noted that if the Fund had a large, single country emerging markets
         investment, the Staff would expect disclosure noting the percentage of
         any specific country concentration.

         RESPONSE: In response to prior Staff comment regarding emerging markets
         disclosure, the Registrant includes, as applicable, the specific
         percentage of emerging markets allocation as of a Fund's fiscal year
         end. The Registrant believes that specific country allocation is more
         appropriate in shareholder reports and Form N-Q. Disclosure was
         previously added directing investors to shareholder reports and Form
         N-Q for a summary of investments by country.







27.      COMMENT: With respect to Janus Adviser Global Research Fund, the Staff
         asked whether there are limits to holding cash as it pertains to the
         statement "However, if the Research Team does not have high conviction
         in enough investment opportunities, the Fund's uninvested assets may be
         held in cash or similar instruments."

         RESPONSE: The Registrant updated the statement to include "under
         unusual circumstances." Under normal circumstances, the Fund intends to
         invest in accordance with its investment objective and strategy.

28.      COMMENT: With respect to Janus Adviser Global Research Fund, the Staff
         stated that the related performance disclosure should be clear that the
         performance reflected is that of a composite rather than the Fund.

         RESPONSE: As discussed during our call, the disclosure states "The
         performance shows the historical track record of the investment
         personnel and should not be relied upon as an indication of the future
         performance of the Fund."

Statement of Additional Information

29.      COMMENT: The Staff stated its view that Rule 13a-1 under the Investment
         Company Act of 1940 is intended to apply to non-diversified funds which
         temporarily become diversified, not non-diversified funds which
         normally operate as diversified funds. Disclosure should accurately
         reflect Janus Adviser Global Real Estate Fund's subclassification.

         RESPONSE: Item 2 of Form N-1A indicates that a Fund classified as
         non-diversified include disclosure that it "may" invest a larger
         portion of its assets in fewer issuers. The Registrant believes its
         disclosure is consistent with Form N-1A. As such, the SAI indicates the
         Fund's classification as non-diversified.

30.      COMMENT: With respect to Janus Adviser Global Real Estate Fund, the
         Staff indicated that disclosure regarding industry concentration in the
         SAI was inconsistent with disclosure in the prospectus pertaining to
         the Fund's investment strategy.

         RESPONSE: The SAI sets forth the fundamental policy that the Fund may
         invest 25% or more in real estate or real estate-related industries as
         a concentration policy under the 1940 Act, which is in addition to and
         separate from the Fund's 80% investment strategy as it relates to the
         Fund Names Rule.

31.      COMMENT: With respect to the "Foreign Securities" disclosure and the
         reference to depositary receipts, the Staff commented that it is
         necessary to discuss the risks of unsponsored depositary receipts in
         association with the Funds' investments in foreign securities.

         RESPONSE: As discussed during our call, the risks of unsponsored
         American Depositary Receipts are discussed under "Depositary Receipts"
         found on the following page of the SAI.

32.      COMMENT: With respect to disclosure related to options on foreign
         currencies, forward contracts, and foreign instruments, the Staff asked
         about underlying instruments to the derivatives.

         RESPONSE: The SAI includes a detailed discussion regarding each type of
         derivative.






33.      COMMENT: The Staff noted that disclosure regarding the structure and
         method of portfolio manager compensation requires identification of any
         benchmark by which performance is measured.

         RESPONSE: The Registrant confirms that benchmarks for measuring
         portfolio manager compensation are identified in the SAI.

34.      COMMENT: At the end of the "Net Asset Value Determination" section, the
         Staff requested an explanation as to how prompt the Registrant
         reprocesses NAV errors.

         RESPONSE: As discussed during our call, the timing of reprocessing is
         dependent upon when an NAV error is detected. If the Registrant
         determines reprocessing is needed, the Registrant reprocesses as soon
         as possible after becoming aware of the NAV error.

35.      COMMENT: The Staff requested that the Registrant provide a Tandy
         representation in a response letter to be filed as correspondence
         separate from the filing.

         RESPONSE: The Registrant provides its response below.

The Registrant acknowledges responsibility for the adequacy and accuracy of the
disclosure in the filings. In addition, the Registrant acknowledges that Staff
comments, or changes to disclosure in response to Staff comments in the filings
reviewed by the Staff, do not foreclose the Commission from taking any action
with respect to the filing.

If you have any concerns regarding the above responses, please call me at (303)
336-4562. Thank you for your assistance in this matter.

Regards,

/s/ Rodney A. DeWalt

Rodney A. DeWalt
Associate Counsel

cc: Stephanie Grauerholz-Lofton, Esq.
    Cindy Antonson
    Donna Brungardt