Frank Harris Hiscock (April 16, 1856 – July 2, 1946) was an American lawyer and politician from New York.

He was born in 1856 to L. Harris Hiscock, a lawyer and New York State Assembly member who founded the Hiscock & Barclay law firm in Syracuse, New York, and who was murdered on June 4, 1867, by General George W. Cole, a brother of Cornelius Cole.

He was a justice of the New York Supreme Court from 1896 to 1913, on the Appellate Division, Fourth Department from 1901 to 1905.

In 1906 Hiscock was appointed to an additional judge seat on the New York Court of Appeals under the Amendment of 1899.

Afterwards he served as Official Referee of the Court of Appeals, and resumed his law practice at Hiscock & Barclay until his retirement in 1935.