Prosper Albert Blanche (September 21, 1909 – April 2, 1997) is a former Major League Baseball pitcher.
He played two seasons with the Boston Braves / Bees from 1935 to 1936.A native of Somerville, Massachusetts, Blanche played several seasons of summer baseball in the Cape Cod Baseball League.
In 1931, he began the season with Wareham, but finished the season with Falmouth.
In 1933 and 1934, he pitched for the league's Harwich team, winning the decisive third game of a three-game championship series sweep for Harwich over Falmouth.
In 1938 after his major league hiatus, he was back in the league with Orleans.