Nicholas Fish II was a United States diplomat who served as the ambassador to Switzerland from 1877 to 1881 and the ambassador to Belgium from 1882 to 1885. In a widely reported crime of the time known as the "sensation of the day," Fish was murdered while leaving a New York City bar.

Hamilton Fish II was a wealthy New Yorker who was a member of a prominent Fish family. During the Spanish–American War he joined the Rough Riders in the invasion of Cuba, where he died in the Battle of Las Guasimas.