Frederic de Peyster Foster (February 20, 1849 – May 25, 1929) was a prominent American lawyer and philanthropist.

[4] After his grandfather's death in 1829, his grandmother remarried to Frederic de Peyster, his namesake, in 1839.

[7] After being admitted to the bar in New York, Foster began practicing law in 1872,[7] with an office at 44 Wall Street in Lower Manhattan.

[7] He also served as a chairman of the Board of Trustees of the New York Society Library in 1907 (and Treasurer in 1899).

[1] They lived at 721 Fifth Avenue, were listed on the Social Register, and together, were the parents of one son:[13] Richmond Talbot Foster, who died in 1932.