| Position: | Defensive back |
| Number: | 27 |
| Birth Date: | 15 July 1941 |
| Birth Place: | Milwaukee, Wisconsin, U.S. |
| Height Ft: | 6 |
| Height In: | 3 |
| Weight Lb: | 195 |
| Draftyear: | 1963 |
| Draftround: | 17 |
| Draftpick: | 234 |
| Afldraftyear: | 1963 |
| Afldraftround: | 29 |
| Afldraftpick: | 232 |
| High School: | Milwaukee (WI) Marquette |
| College: | Miami (FL) |
| Pastteams: | |
| Statlabel1: | Games played |
| Statvalue1: | 3 |
John Martin Sisk III (born July 15, 1941[1]) is a former American football defensive back in the National Football League (NFL). He played in three games for the Chicago Bears in 1964. He played at the collegiate level at Marquette University and the University of Miami. His father Johnny Sisk played for the Chicago Bears from 1932 to 1936.