| Year: | 1966 |
| Team: | Grambling Tigers |
| Sport: | football |
| Conference: | Southwestern Athletic Conference |
| Short Conf: | SWAC |
| Record: | 6–2–1 |
| Conf Record: | 4–2–1 |
| Head Coach: | Eddie Robinson |
| Hc Year: | 24th |
| Stadium: | Grambling Stadium |
| Champion: | SWAC co-champion |
The 1966 Grambling Tigers football team represented Grambling College (now known as Grambling State University) as a member of the Southwestern Athletic Conference (SWAC) during the 1966 NCAA College Division football season. Led by 24th-year head coach Eddie Robinson, the Tigers compiled an overall record of 6–2–1 and a mark of 4–2–1 in conference play, and finished as SWAC co-champion.