| Mário Seixas | |
| Birth Date: | 22 April 1902 |
| Birth Place: | Campos dos Goytacazes, Brazil |
| Position: | Forward |
| Nationalteam1: | Brazil |
| Nationalyears1: | 1923 |
| Nationalcaps1: | 3 |
| Nationalgoals1: | 0 |
Mário Seixas (born 22 April 1902, date of death unknown) was a Brazilian footballer. He played in three matches for the Brazil national football team in 1923.[1] He was also part of Brazil's squad for the 1923 South American Championship.[2]