| Alfonso Montemayor | |
| Fullname: | Alfonso Montemayor Crespo |
| Birth Date: | 28 April 1922 |
| Birth Place: | Tampico, Mexico |
| Death Date: | [1] |
| Death Place: | León, Guanajuato, Mexico |
| Position: | Defender |
| Clubs1: | Club León |
| Nationalyears1: | 1947–1952 |
| Nationalteam1: | Mexico |
| Nationalcaps1: | 8 |
| Nationalgoals1: | 0 |
Alfonso Montemayor Crespo (28 April 1922 – 23 November 2012) was a Mexican football defender who played for Mexico in the 1950 FIFA World Cup.[2] He also played for Club León.