EXHIBIT 23.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS Merrill Lynch & Co., Inc. We hereby consent to the use in this Form 11-K Annual Report of our report dated June 21, 2002 (relating to the financial statements of the Merrill Lynch & Co., Inc. 401(k) Savings & Investment Plan) appearing in Item (a) of such Form 11-K. /s/ Deloitte & Touche LLP New York, New York June 21, 2002