Alfred M. Saperston, a lawyer and trustee emeritus of Cornell University, died yesterday at his home in Buffalo. He was 84 years old.

Mr. Saperston, a corporate lawyer, had retired four years ago from the firm of Saperston Day Lustig Gallick Kirschner & Gaglione, which his father founded in 1893. He had practiced law in his native Buffalo for some 60 years.

Mr. Saperston, a graduate of Cornell, was a past president of the Federation of Cornell University's Men's Clubs, president of the Cornell Law Association and national chairman of the Cornell Fund.

His community activities included service as a director of the United Fund of Buffalo and Erie County, the Community Welfare Council and the Children's Aid Society. He was a founder of Buffalo's educational television station, WNED, and received a Brotherhood Week award from the National Conference of Christians and Jews in 1964.

Mr. Saperston is survived by his wife, the former Josephine Lee; a daughter, Frances J. Klingenstein of Scarsdale, N.Y.; a son, Lee R., of Manhatttan; a brother, Howard T., of Buffalo, and three grandchildren.