| Position: | Center/Linebacker |
| Number: | 56 |
| Birth Date: | 10 November 1917 |
| Birth Place: | Glendale, Arizona, U.S. |
| Draftyear: | 1939 |
| Draftround: | 15 |
| Draftpick: | 139 |
| High School: | Peoria (AZ) |
| College: | Arizona |
| Pastteams: |
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| Statlabel1: | Games played |
| Statvalue1: | 22 |
| Statlabel2: | Games started |
| Statvalue2: | 3 |
| Statlabel3: | Interceptions |
| Statvalue3: | 1 |
| Pfr: | GreeTo21 |
| Highlights: |
Thomas Guy Greenfield (November 10, 1917 – October 9, 2004) was a professional American football center/linebacker in the National Football League (NFL). He was drafted in the 15th round of the 1939 NFL Draft.[1] Greenfield, who was born in Glendale, Arizona, played for the Green Bay Packers from 1939 to 1941. A member of the 1939 NFL Champion Packers, he played in the annual All-Star Game that year. He played college football at the University of Arizona, where he was a member of the Sigma Alpha Epsilon fraternity.[2]