Oscar Sylvester "Cotton" Siemer (August 14, 1901 – December 5, 1959) was a Major League Baseball player. He played two seasons with the Boston Braves from 1925 to 1926.
Oscar Siemer
| Given name: | Oscar Sylvester Siemer |
| Nicknames: | Cotton |
| Primary Pos: | Catcher |
| Hght/Wght: | 5'9" / 162 lbs |
| Bats/Throws: | R / R |
| Born: | Aug 14, 1901 in St. Louis, MO |
| Died: | Dec 5, 1959 in St. Louis, MO (58 years old) |
| Debut: | May 20, 1925 |