Exhibit 23(a) CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statement on Form S-8, relating to the Alcoa Stock Incentive Plan of Alcoa Inc. and the shares of common stock to be issued in accordance with the Plan, of our reports dated January 8, 1999 on our Audits of the consolidated financial statements and financial statement schedule of Alcoa Inc. and consolidated subsidiaries as of December 31, 1998 and 1997, and for each of the three years in the period ended December 31, 1998, which reports are incorporated by reference or included in the Company's 1998 Annual Report on Form 10-K for the fiscal year ended December 31, 1998. /s/PricewaterhouseCoopers LLP PricewaterhouseCoopers LLP Pittsburgh, Pennsylvania May 28, 1999