Alfred W. Fleisher (c. 1878 - December 25, 1928) was an American real estate investor and philanthropist. He was the co-founder and head of Mastbaum Brothers & Fleisher, and the president of the board of trustees of the Eastern State Penitentiary. He supported prison reform.

Fleisher was born circa 1878 in Philadelphia.^[1] He began his career in real estate with Stanley Mastbaum in his hometown, with an office on Walnut Street.^[1] They were joined by Stanley's brother Jules in 1912, and the firm became known as Mastbaum Brothers & Fleisher.^[1] Jules Mastbaum died in 1926, and Fleisher became the head of the firm.^[2]

Fleisher was a philanthropist. He donated to the Jewish Federation of Charities in Philadelphia, and he served as the president of the board of trustees of the Eastern State Penitentiary.^[3] He supported prison reform, including providing prisoners with employment opportunities,^[1] and he "felt that work in the open amid healthful surroundings would help the convicts both physically and morally."^[4] Fleisher supported their families financially while they were away,^[1] and he helped them once they left prison.^[4]

Fleisher married Selma Gerstley, the daughter of German-born philanthropist William Gerstley,^[5] and they resided in Wyncote, Pennsylvania near Philadelphia. They had two sons, Howard and Robert, and a daughter, Susan.^[1] Fleisher was a member of Congregation Keneseth Israel,^[3] and he was one of the largest collectors of etchings in the U.S.^[1] He died on December 25, 1928, in Wyncote, at age 50.^[6][2][7] His daughter married Ralph J. Roberts, the founder of Comcast. His grandson, Brian L. Roberts, serves as its chairman and chief executive officer.