Emil Arthur "Bud" Roy (May 26, 1907 – January 5, 1997) was an American professional baseball pitcher. He played one game in Major League Baseball in 1933 with the Philadelphia Athletics. He batted and threw right-handed.

A native of Brighton, Massachusetts, Roy played college baseball for Boston College,^[1][2][3] hurling a 15-strikeout game against Mount St. Mary's University in 1932.^[4] While at Boston College, he played summer baseball in the Cape Cod Baseball League, twirling for the league's Wareham team in 1932,^[5][6] and for the Barnstable and Falmouth teams in 1933.^[7][8][9]

In September 1933, Roy was signed by Connie Mack's Philadelphia Athletics. Roy appeared in a single game for the Athletics that season, taking the mound to start the second game of a doubleheader on September 30 at Shibe Park against the Boston Red Sox. The Athletics' defense behind Roy boasted Baseball Hall of Fame first baseman Jimmie Foxx. Roy lasted two and a third innings, striking out three and yielding seven earned runs on four hits and four walks, including a hit and a walk to Hall of Fame catcher Rick Ferrell. Roy was relieved by Hank Winston, who went the rest of the way for Philadelphia in a 12-1 loss.^[10][11]

Roy died in Crystal River, Florida in 1997 at the age of 89.