Exhibit 5


May 3, 2000



U.S. Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C.  20549

Dear Sir or Madam:

This opinion is furnished in connection with the registration by Alcoa Inc. (the
"Company") pursuant to a Registration Statement on Form S-8 (the "Registration
Statement") under the Securities Act of 1933, as amended (the "1933 Act"), of an
aggregate of 400,000 shares of common stock, $1.00 par value, of the Company
(the "Shares"), which are to be offered and sold by the Company through the
following plans: the Reynolds Metals Company Savings and Investment Plan for
Salaried Employees, the Reynolds Metals Company Savings Plan for Hourly
Employees and the Reynolds Metals Company Employees Savings Plan (collectively,
the "Plans").

As Senior Counsel of the Company, I am of the opinion, based upon my familiarity
with the affairs of the Company and upon my examination of the law and pertinent
documents, that the Shares, when issued and sold pursuant to the Plans, will be
legally issued, fully paid and non-assessable shares of common stock of the
Company.

I hereby consent to the filing of this opinion with the Securities and Exchange
Commission (the "Commission") as an Exhibit to the Registration Statement with
respect to the Shares under the 1933 Act.  In giving this consent, I do not
admit that I am in the category of persons whose consent is required under
Section 7 of the Securities Act or the Rules and Regulations of the Commission
issued thereunder.

Very truly yours,

/s/ Denis A. Demblowski

Denis A. Demblowski
Senior Counsel