Prosper Albert Blanche (September 21, 1909 – April 2, 1997) was a Major League Baseball pitcher. He played two seasons with the Boston Braves / Bees from 1935 to 1936.
A native of Somerville, Massachusetts, Blanche was the son of Italian emigrants and the youngest of four children. He attended Somerville High School, and played college baseball at Providence College, graduating with a degree in philosophy in 1934. While at Providence, he played summer baseball in the Cape Cod Baseball League (CCBL). In 1931, he began the CCBL 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.
Blanche caught on with the big league Braves near the end of the 1935 season. Though it was the end of a dismal campaign for the Boston club, Blanche posted an impressive 1.56 ERA in 17.mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}1⁄3 innings over six appearances. His debut came on August 23, when he tossed four innings in relief of Ben Cantwell, allowing two earned runs and smacking a hit in the Braves' 7–5 loss to the Pittsburgh Pirates at Braves Field. His best outing came on September 29 in the first game of a home doubleheader against the New York Giants and hurler Al Smith. With the Braves down 5–2 after three innings, Boston starter Ed Brandt was lifted for Blanche, who finished with six strong shutout innings in the eventual 5–3 loss.

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