| Dewey Mayhew | |
| Birth Date: | 1898 12, mf=y |
| Birth Place: | Texas, U.S. |
| Death Place: | Temple, Texas, U.S. |
| Coach Sport1: | Football |
| Coach Years2: | 1923–1926 |
| Coach Team2: | Marlin HS (TX) |
| Coach Years3: | 1927–1940 |
| Coach Team3: | Abilene HS (TX) |
| Coach Years4: | 1945 |
| Coach Team4: | Southwestern (TX) (assistant) |
| Coach Years5: | 1946–1953 |
| Coach Team5: | Texas A&I |
| Coach Sport6: | Baseball |
| Coach Years7: | 1946 |
| Coach Team7: | Southwestern (TX) |
| Admin Years1: | 1946–1954 |
| Admin Team1: | Texas A&I |
| Overall Record: | 39–34–1 (college football) 0–13 (college baseball) |
| Bowl Record: | 1–0 |
| Championships: | Football 2 Texas Conference (1951, 1953) |
Dewey Alexander Mayhew (December 21, 1898 – January 6, 1974) was an American football and baseball coach. He coached high school football at Marlin and Abilene, before serving as head coach at Texas College of Arts and Industries—now known as Texas A&M University–Kingsville—from 1946 to 1953. Mayhew won to state championships at Abilene (1928, 1931) and left as the all-time winningest coach with a record of 97–36–11, but was passed in 2007 by current Abilene coach Steve Warren.[1] He died of congestive heart failure in 1974.