Nathaniel Pierce Blish Jr., known professionally as Nat Pierce (July 16, 1925 – June 10, 1992) was an American jazz pianist and prolific composer and arranger, perhaps best known for being pianist and arranger for the Woody Herman band from 1951 to 1955. Pieces by Pierce were predominantly created for use in big bands.

Pierce was born in Somerville, Massachusetts. United States. Following schooling at the New England Conservatory and working as an amateur musician in the Boston area, Pierce then led his own band which featured Charlie Mariano from 1949 to 1951. After working with Woody Herman from 1951 to 1966 as chief arranger and assistant road manager, Pierce took residence in New York City and freelanced with musicians such as Pee Wee Russell, Lester Young, Emmett Berry and Ruby Braff.