Exhibit 24

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned Directors of Alcoa
Inc. (the "Company") hereby constitute and appoint RICHARD B. KELSON, WILLIAM B.
PLUMMER, TIMOTHY S. MOCK AND DONNA C. DABNEY, or any of them, their true and
lawful attorneys and agents to do any and all acts and things and to execute any
and all instruments which said attorneys and agents, or any of them, may deem
necessary or advisable or may be required to enable the Company to comply with
the Securities Act of 1933, as amended (the "Act"), and any rules, regulations
or requirements of the Securities and Exchange Commission in respect thereof, in
connection with the registration under the Act of up to $3 billion of
securities, including, but not limited to, debt, convertible, common, preferred
or hybrid securities of the Company, warrants to purchase debt securities of the
Company, or guarantees by the Company of debt or convertible preferred
securities of an affiliate of the Company (including without limitation the
Alcoa Trust I), including specifically, but without limiting the generality of
the foregoing, power and authority to sign the name of each of the undersigned
in the capacity of Director of the Company to any registration statement to be
filed with the Securities and Exchange Commission in respect of said securities,
to any and all pre-effective amendments, post-effective amendments and
supplements to any such registration statement, and to any instruments or
documents filed as part of or in connection with any such registration statement
or pre-effective amendments, post-effective amendments or supplements thereto;
and the undersigned hereby ratify and confirm all that said attorneys and
agents, or any of them, shall do or cause to be done by virtue thereof.

     IN WITNESS WHEREOF, the undersigned have subscribed these presents on the
date set opposite their names below.


/s/ Joseph T. Gorman                      April 2, 2001
- --------------------
Joseph T. Gorman


/s/ Judith M. Gueron                      April 2, 2001
- --------------------
Judith M. Gueron


/s/ Sir Ronald Hampel                     April 2, 2001
- ---------------------
Sir Ronald Hampel


/s/ Hugh M. Morgan                        April 2, 2001
- ------------------
Hugh M. Morgan


/s/ John P. Mulroney                      April 2, 2001
- --------------------
John P. Mulroney


/s/ Henry B. Schacht                      April 2, 2001
- --------------------
Henry B. Schacht


/s/ Franklin A. Thomas                    April 2, 2001
- ----------------------
Franklin A. Thomas


/s/ Marina v.N. Whitman                    April 2, 2001
- -----------------------
Marina v.N. Whitman


                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned Director and
Chairman of the Board and Chief Executive Officer of Alcoa Inc. (the "Company")
hereby constitutes and appoints RICHARD B. KELSON, WILLIAM B. PLUMMER, TIMOTHY
S. MOCK AND DONNA C. DABNEY, or any of them, his true and lawful attorneys and
agents to do any and all acts and things and to execute any and all instruments
which said attorneys and agents, or any of them, may deem necessary or advisable
or may be required to enable the Company to comply with the Securities Act of
1933, as amended (the "Act"), and any rules, regulations or requirements of the
Securities and Exchange Commission in respect thereof, in connection with the
registration under the Act of up to $3 billion of securities, including, but not
limited to, debt, convertible, common, preferred or hybrid securities of the
Company, warrants to purchase debt securities of the Company, or guarantees by
the Company of debt or convertible preferred securities of an affiliate of the
Company (including without limitation the Alcoa Trust I), including
specifically, but without limiting the generality of the foregoing, power and
authority to sign the name of the undersigned Director and Chairman of the Board
and Chief Executive Officer of the Company in the capacity of Principal
Executive Officer and/or Director thereof to any registration statement to be
filed with the Securities and Exchange Commission in respect of said securities,
to any and all pre-effective amendments, post-effective amendments and
supplements to any such registration statement, and to any instruments or
documents filed as part of or in connection with any such registration statement
or pre-effective amendments, post-effective amendments or supplements thereto;
and the undersigned hereby ratifies and confirms all that said attorneys and
agents, or any of them, shall do or cause to be done by virtue thereof.

     IN WITNESS WHEREOF, the undersigned has subscribed these presents on the
date set opposite his name below.


/s/ Alain J. P. Belda                        April 3, 2001
- --------------------------------
Alain J. P. Belda
Director and
Chairman of the Board and
Chief Executive Officer


                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned Executive Vice
President and Chief Financial Officer of Alcoa Inc. (the "Company") hereby
constitutes and appoints WILLIAM B. PLUMMER, TIMOTHY S. MOCK AND DONNA C.
DABNEY, or any of them, his true and lawful attorneys and agents to do any and
all acts and things and to execute any and all instruments which said attorneys
and agents, or any of them, may deem necessary or advisable or may be required
to enable the Company to comply with the Securities Act of 1933, as amended (the
"Act"), and any rules, regulations or requirements of the Securities and
Exchange Commission in respect thereof, in connection with the registration
under the Act of up to $3 billion of securities, including, but not limited to,
debt, convertible, common, preferred or hybrid securities of the Company,
warrants to purchase debt securities of the Company, or guarantees by the
Company of debt or convertible preferred securities of an affiliate of the
Company (including without limitation the Alcoa Trust I), including
specifically, but without limiting the generality of the foregoing, power and
authority to sign the name of the undersigned Executive Vice President and Chief
Financial Officer of the Company in the capacity of Principal Financial Officer
thereof to any registration statement to be filed with the Securities and
Exchange Commission in respect of said securities, to any and all pre-effective
amendments, post-effective amendments and supplements to any such registration
statement, and to any instruments or documents filed as part of or in connection
with any such registration statement or pre-effective amendments, post-effective
amendments or supplements thereto; and the undersigned hereby ratifies and
confirms all that said attorneys and agents, or any of them, shall do or cause
to be done by virtue thereof.

     IN WITNESS WHEREOF, the undersigned has subscribed these presents on the
date set opposite his name below.


/s/ Richard B. Kelson                        April 3, 2001
- ------------------------------------
Richard B. Kelson
Executive Vice President and
Chief Financial Officer


                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned Vice President and
Controller of Alcoa Inc. (the "Company") hereby constitutes and appoints RICHARD
B. KELSON, WILLIAM B. PLUMMER AND DONNA C. DABNEY, or any of them, his true and
lawful attorneys and agents to do any and all acts and things and to execute any
and all instruments which said attorneys and agents, or any of them, may deem
necessary or advisable or may be required to enable the Company to comply with
the Securities Act of 1933, as amended (the "Act"), and any rules, regulations
or requirements of the Securities and Exchange Commission in respect thereof, in
connection with the registration under the Act of up to $3 billion of
securities, including, but not limited to, debt, convertible, common, preferred
or hybrid securities of the Company, warrants to purchase debt securities of the
Company, or guarantees by the Company of debt or convertible preferred
securities of an affiliate of the Company (including without limitation the
Alcoa Trust I), including specifically, but without limiting the generality of
the foregoing, power and authority to sign the name of the undersigned Vice
President and Controller of the Company in the capacity of Principal Accounting
Officer thereof to any registration statement to be filed with the Securities
and Exchange Commission in respect of said securities, to any and all pre-
effective amendments, post-effective amendments and supplements to any such
registration statement, and to any instruments or documents filed as part of or
in connection with any such registration statement or pre-effective amendments,
post-effective amendments or supplements thereto; and the undersigned hereby
ratifies and confirms all that said attorneys and agents, or any of them, shall
do or cause to be done by virtue thereof.

     IN WITNESS WHEREOF, the undersigned has subscribed these presents on the
date set opposite his name below.


/s/ Timothy S. Mock                          April 3, 2001
- ---------------------------------------
Timothy S. Mock
Vice President and Controller