| Number: | 14, 18 |
| Position: | Back |
| Birth Date: | 15 May 1903 |
| Birth Place: | Wapakoneta, Ohio, U.S. |
| Death Place: | Montgomery County, Ohio, U.S. |
| Height Ft: | 5 |
| Height In: | 11 |
| Weight Lbs: | 179 |
| High School: | Stivers (Dayton, Ohio) |
| College: | Western Maryland |
| Teams: |
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| Statlabel1: | Games |
| Statvalue1: | 17 |
Frank P. Sillin (May 15, 1903 – December 29, 1932) was an American football player. He played college football at Western Maryland College (now known as McDaniel College) as a fullback from 1924 to 1926 and was captain of the school's 1926 team.[1] He later professional football in the National Football League (NFL) as a back for the Dayton Triangles. He appeared in 17 NFL games, 12 as a starter, during the 1921, 1927, 1928, and 1929 seasons.[2] He died in 1932 at age 29 of influenza and pneumonia.[3]