[LETTERHEAD OF STUBBS, ALDERTON & MARKILES, LLP]

                                           JOHN MCILVERY
                                           Partner
                                           Direct       818.444.4502
                                           Voice
                                           Direct Fax   818.474.8602
                                           Mobile       626.705.0758
                                           E-Mail       jmcilvery@biztechlaw.com


May 23, 2007

VIA EDGAR AND FACSIMILE

Securities and Exchange Commission
Division of Corporation Finance
100 F Street, N.E.
Washington, D.C. 20549-3561

         RE:      IRIS INTERNATIONAL, INC.
                  RESPONSES TO STAFF COMMENTS OF APRIL 26, 2007

Ladies and Gentlemen:

         On  behalf  of IRIS  International,  Inc.  (the  "COMPANY"),  we hereby
provide the following  responses in reply to the Staff's comment  letter,  dated
April 26, 2007 (the "COMMENT LETTER").  The factual information  provided herein
relating to the Company has been made available to us by the Company.  Paragraph
numbering  used for each response set forth below  corresponds  to the numbering
used in the Comment Letter.

FORM 10-K FOR THE FISCAL YEAR ENDED DECEMBER 31, 2006

CONSOLIDATED STATEMENTS OF OPERATIONS, PAGE 42

1.       REVENUE  AND  THE  RELATED   COST  OF  SALES  FROM  RENTAL  OR  SERVICE
         ARRANGEMENTS  THAT  ACCOUNT  FOR MORE THAN 10% OF NET  SALES  SHOULD BE
         SEPARATELY  PRESENTED  ON THE  FACE OF THIS  STATEMENT.  PLEASE  REVISE
         FUTURE  FILINGS AS  NECESSARY  TO  SEPARATELY  PRESENT THE REVENUES AND
         RELATED  COSTS OF SALES FROM  TANGIBLE  GOODS,  SERVICES AND RENTALS ON
         YOUR  CONSOLIDATED  STATEMENTS  OF INCOME  OR TELL US HOW YOUR  CURRENT
         PRESENTATION  COMPLIES  WITH RULE  5-03(B)(1)  AND RULE  5-03(B)(2)  OF
         REGULATIONS S-X.

         The Company  believes  that the current  presentation  of revenues from
         rental or service arrangements  complies with Rules 5-03(b)(1) and Rule
         5-03(b)(2) of Regulations S-X.  Revenues from both rental  arrangements
         and service  arrangements  accounted for less than 10% of net sales for
         the twelve  months ended  December  31, 2006,  as well as for the three
         months ended March 31, 2007.

         Rental revenue,  which is included in "Sales of IVD instruments" in the
         Consolidated Statements of Operations, amounted to $335,000 and $45,000


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Securities and Exchange Commission
May 23, 2007
Page 2


         for the twelve  months  ended  December  31, 2006 and the three  months
         ended March 31, 2007,  respectively,  or less than 1% of total revenues
         in both periods.

         Service  revenue,  which is included in both "Sales of IVD  consumables
         and service" and "Sales of sample processing  instruments and supplies"
         in the Consolidated  Statements of Operations,  amounted to $6,127,000,
         or 8.7% of total  revenues  for the twelve  months  ended  December 31,
         2006,  and  $1,674,000,  or 8.3% of total revenues for the three months
         ended March 31, 2007.

         The Company  will  continue to monitor its rental and service  revenues
         each quarter to determine if the 10% threshold is exceeded.

NOTE 2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, PAGE 47

REVENUE RECOGNITION, PAGE 49

2.       WE SEE FROM  YOUR  DISCLOSURE  ON PAGE 10 THAT YOU SELL  YOUR  PRODUCTS
         INTERNATIONALLY  THROUGH DISTRIBUTORS AND ON PAGE 61 THAT APPROXIMATELY
         $20.1  MILLION OF YOUR  SALES ARE TO  INTERNATIONAL  CUSTOMERS.  PLEASE
         DESCRIBE  FOR  US  THE  SIGNIFICANT   TERMS  OF  YOUR  AGREEMENTS  WITH
         DISTRIBUTORS,  INCLUDING  PAYMENT,  RIGHTS OF RETURN,  EXCHANGE,  PRICE
         PROTECTION AND OTHER SIGNIFICANT MATTERS. EXPLAIN AND SUPPORT WHY IT IS
         APPROPRIATE TO RECOGNIZE  REVENUE TO INTERNATIONAL  DISTRIBUTORS AT THE
         TIME OF  SHIPMENT.  REFER TO SAB 104 AND SFAS 48 AS  NECESSARY.  PLEASE
         ALSO REVISE FUTURE FILINGS TO COMPLY.

         The  Company   utilizes   standardized   distribution   agreements  for
         substantially  all of its  distributors for the sale of its products in
         approximately  60  countries.  The  following is a brief summary of the
         material terms of the Company's standardized distribution agreements:

         o        SHIPPING - FOB Chatsworth, California.

         o        PRICING - US Dollars.

         o        PAYMENTS  - Via  wire  transfer  within  sixty  (60)  days  of
                  invoice.

         o        CREDIT LIMITS - Each distributor is given a credit limit based
                  on its credit worthiness.

         o        RIGHT OF RETURN - A  distributor  may only return  products to
                  the Company if defective.  No product may be returned  without
                  the Company's prior written authorization.

         o        PRICE PROTECTION - None.



Securities and Exchange Commission
May 23, 2007
Page 3


         o        WARRANTY - The Company warrants that its products will be free
                  from defects for a period of the lesser of fifteen (15) months
                  from date of  shipment  or twelve (12) months from the date of
                  installation.

         o        TERMINATION - Ninety (90) days written notice by either party.

         The Company has reviewed SAB 104 and SFAS 48 and has concluded  that it
         has  met  all  of  the  revenue  recognition   criteria  for  sales  to
         international customers during 2006, as reported in the Form 10-K.

NOTE 3.  ACQUISITIONS, PAGE 52

3.       WE SEE THAT A  SIGNIFICANT  PORTION OF THE  PURCHASE  PRICE OF LEUCADIA
         TECHNOLOGIES  WAS  ALLOCATED TO  IN-PROCESS  RESEARCH AND  DEVELOPMENT.
         PLEASE TELL US AND REVISE FUTURE  FILINGS TO DISCLOSE THE NATURE OF THE
         IN-PROCESS  PROJECTS  ACQUIRED  AND HOW THE FAIR VALUE WAS  DETERMINED.
         PLEASE  ALSO TELL US THE STATE OF  COMPLETION  AT  ACQUISITION  AND THE
         EXTENT OF EFFORT  NECESSARY  TO  COMPLETE  THE  IN-PROCESS  PROJECT(S),
         INCLUDING  COSTS.  DISCLOSE  WHETHER  THE  TECHNOLOGY  WAS  BROUGHT  TO
         FRUITION, AND IF NOT, DISCLOSE WHY NOT. ADDITIONALLY,  IN PERIODS AFTER
         A  SIGNIFICANT  WRITE-OFF  YOU SHOULD  DISCUSS THE STATUS OF EFFORTS TO
         COMPLETE THE PROJECTS,  AND THE ACTUAL OR EXPECTED IMPACT OF ANY DELAYS
         ON YOUR EXPECTED INVESTMENT RETURN, RESULTS OF OPERATIONS AND FINANCIAL
         CONDITION.

         The  in-process  research  and  development  acquired  as  part  of the
         acquisition in April 2006 of Leucadia Technologies, Inc., a development
         stage  company,  focused  on the  development  of  ultra-sensitive  and
         specific  in-vitro   diagnostic   products  based  on   ultra-sensitive
         detection  technologies  combined  with novel and  specific  methods of
         isolation of rare cells from biological fluids.

         Subsequent  to  the  purchase  of  Leucadia,  the  Company  engaged  an
         independent advisory firm that specialized in valuing intangible assets
         in accordance with SFAS 141. The valuation  included  discussions  with
         the Company  concerning  existing  products  and current  research  and
         development  efforts.  Additionally,  the  valuation  firm followed the
         guidelines of SFAS No. 86, SFAS No. 2, FIN4 and FIN6 in addressing  the
         identification  and  valuation  of  intangible  assets,  as well as the
         classification  of the assets as  completed  technology  or  technology
         under  development.  Following  these  discussions  and applying  these
         guidelines,  the valuation  firm  concluded and agreed with the Company
         that  Leucadia's (i)  ultra-sensitive  Prostate-Specific  Antigen (PSA)
         utilizing its Nucleic Acid Detection  Immuno-Assay  technology and (ii)
         bubble  isolation  and  separation  technology  for  the  detection  of
         bacteria in urine,  were programs  under  development as of the date of
         acquisition.  In  addition,  the Company  concluded  that  Leucadia had



Securities and Exchange Commission
May 23, 2007
Page 4


         completed the development of core detection and isolation technologies.
         The valuation of the  technologies  under  development was based on the
         income  approach  utilizing the discounted  cash flow method applied to
         the projected  cash flows  associated  with  Leucadia's  products under
         development over their expected life.

         In February 2007, the Company filed a 510(k)  application with the U.S.
         Food and Drug  Administration  (FDA) for its PSA test, which was within
         the expected  development  timeline of the product. The Company expects
         the PSA test to be launched by the end of 2007 after FDA clearance.  In
         addition,  the Company is on schedule with its development  program for
         the  bacteria  screening  tests.  The Company  expects to conclude  its
         feasibility studies mid-year. Following these studies, the Company will
         proceed  to the next  phase  of  development  with its  instrumentation
         product   development  group,  to  facilitate  the  development  of  an
         automated  bacteria  screening  instrument  to  indicate  if  there  is
         bacteria  and/or  yeast  present  in  urine.  The  Company  anticipates
         launching this product in 2009. There have been no impairments of these
         technologies  since  acquisition,  as the Company continues to progress
         with  the  development  and  commercialization  of  these  products  in
         accordance  with  its  internal  development  timelines.   The  Company
         anticipates  that it will meet the target dates for  completion of each
         of these projects. The costs for completing these projects are included
         in the Company's total research and development budget.

EXHIBIT 3.1

4.       WE NOTE THE  SECTION 302  CERTIFICATION  OF YOUR CEO AND CFO ARE NOT IN
         THE PROPER FORM AS PARAGRAPH 4 IMPROPERLY REFERENCES EXCHANGE ACT RULES
         13A-14  AND  15D-14  AND  EXCHANGE  ACT RULES  13A-15-15(F).  IN FUTURE
         FILINGS,  PLEASE  FILE  SECTION  302  CERTIFICATIONS  SET FORTH IN ITEM
         601(B)(31) OF REGULATION S-K WHICH PROPERLY REFER TO EXCHANGE ACT RULES
         13A-15(E) AND 15D-15(E) AND EXCHANGE ACT RULES 13A-15(F), RESPECTIVELY.
         ADDITIONALLY, AS PART OF YOUR RESPONSE, PLEASE REPRESENT TO US THAT THE
         SECTION 302 CERTIFICATIONS MEET THE DEFINITIONS AS DETAILED IN EXCHANGE
         ACT RULES 13A-15(E) AND 15D-15(E) AND EXCHANGE ACT RULES 13A-15(F).

         The Company notes the error in the Section 302  certifications and will
         ensure  that  such  certifications  are in  proper  form in all  future
         filings.  Additionally,  the Company  represents  to the Staff that the
         Section 302  certifications  in the Form 10-K meet the  definitions  as
         detailed in Exchange Act Rules 13a-15(e) and 15d-15(e) and Exchange Act
         Rules 13a-15(f).

5.       IN THIS  REGARD,  WE NOTE THAT THE  CERTIFICATION  FILED AS REQUIRED BY
         EXCHANGE ACT RULE 13A-14(A)  IMPROPERLY LABELS THE REPORT AS AN "ANNUAL
         REPORT"  IN  PARAGRAPHS  1,  2,  3  AND  4.  IN  FUTURE  FILINGS,   THE
         CERTIFICATION  SHOULD BE REVISED SO AS TO NOT  INCLUDE A  REFERENCE  TO
         "ANNUAL" OR "QUARTERLY" REPORTS. REFER TO ITEM 601(B)(31) OF REGULATION
         S-K.



Securities and Exchange Commission
May 23, 2007
Page 5


         The  Company  notes the Staff's  comments  and will omit  reference  to
         "Annual" or "Quarterly"  reports in the certifications  included in all
         future filings.

FORM 8-K FILED MARCH 7, 2007

6.       WE NOTE THAT YOU PRESENT YOUR NON-GAAP MEASURES AND  RECONCILIATIONS IN
         THE  FORM  OF  SUPPLEMENTAL   INFORMATION  AS  ADJUSTED  STATEMENTS  OF
         OPERATIONS.  THIS  FORMAT  MAY BE  CONFUSING  TO  INVESTORS  AS IT ALSO
         REFLECTS  SEVERAL  NON-GAAP  MEASURES,  INCLUDING (AND NOT  NECESSARILY
         LIMITED TO) NON-GAAP COST OF GOOD SOLD, NON-GAAP GROSS MARGIN, NON-GAAP
         TOTAL OPERATING  EXPENSES,  NON-GAAP OPERATING INCOME (LOSS),  NON-GAAP
         INCOME  (LOSS) BEFORE INCOME  TAXES,  NON-GAAP  INCOME TAXES  PROVISION
         (BENEFIT),  NON-GAAP NET INCOME  (LOSS) AND  NON-GAAP  BASIC NET INCOME
         (LOSS) PER SHARE WHICH HAVE NOT BEEN  DESCRIBED TO INVESTORS.  IN FACT,
         IT APPEARS THAT  MANAGEMENT  DOES NOT USE THESE  NON-GAAP  MEASURES BUT
         THEY ARE SHOWN HERE AS A RESULT OF THE PRESENTATION FORMAT. PLEASE NOTE
         THAT  INSTRUCTION  2 TO ITEM  2.02  OF  FORM  8-K  REQUIRES  THAT  WHEN
         FURNISHING  INFORMATION  UNDER  THIS  ITEM  YOU  MUST  PROVIDE  ALL THE
         DISCLOSURES  REQUIRED BY PARAGRAPH  (e)(1)(i) OF ITEM 10 OF  REGULATION
         S-K, INCLUDING A RECONCILIATION TO THE DIRECTLY COMPARABLE GAAP MEASURE
         FOR EACH  NON-GAAP  MEASURE  PRESENTED  AND EXPLAIN WHY YOU BELIEVE THE
         MEASURES PROVIDE USEFUL INFORMATION TO INVESTORS.

         o        TO ELIMINATE  INVESTOR  CONFUSION,  PLEASE REMOVE THE ADJUSTED
                  STATEMENTS  OF INCOME  FROM ALL  FUTURE  FILINGS  AND  INSTEAD
                  DISCLOSE ONLY THOSE NON-GAAP  MEASURES USED BY MANAGEMENT THAT
                  YOU  WISH  TO  HIGHLIGHT  FOR  INVESTORS,   WITH   APPROPRIATE
                  RECONCILIATIONS.

         o        PLEASE   NOTE  THAT  IN  THE  EVENT  THAT  YOUR  FORM  8-K  IS
                  INCORPORATED  BY  REFERENCE  INTO  A  1933  ACT   REGISTRATION
                  STATEMENT,  WE MAY HAVE ADDITIONAL  QUESTIONS  RELATING TO THE
                  APPROPRIATENESS  OF  THIS  INFORMATION  BEING  INCLUDED  IN  A
                  DOCUMENT   FILED  WITH,   AND  NOT  JUST   FURNISHED  TO,  THE
                  COMMISSION.  AT THAT TIME,  WE MAY REQUEST AN AMENDMENT TO THE
                  FORM 8-K.

         The Company notes the Staff's comments and will comply with the Staff's
         requests in all future  filings  that  include  disclosure  of non-GAAP
         financial measures.

                                    * * * * *



Securities and Exchange Commission
May 23, 2007
Page 6


         The Company acknowledges that:

         o        the company is  responsible  for the  adequacy and accuracy of
                  the disclosure in the filing;

         o        staff  comments or changes to  disclosure in response to staff
                  comments  do not  foreclose  the  Commission  from  taking any
                  action with respect to the filing; and

         o        the company may not assert staff  comments as a defense in any
                  proceeding initiated by the Commission or any person under the
                  federal securities laws of the United States.

         We hope the above has been responsive to the Staff's  comments.  If you
have any questions or require any additional  information  or documents,  please
telephone  Veronica  Tarrant,  the Company's  Interim Chief Financial Officer at
(818) 709-1244 x7256 or the undersigned at (818) 444-4502.

                                           Sincerely,

                                           /s/ John J. McIlvery
                                           -------------------------
                                           John J. McIlvery

cc:      Cesar Garcia
         Veronica Tarrant