| Hélder de Souza | |
| Fullname: | Hélder de Souza Martins |
| Nationality: | Portuguese |
| Birth Date: | 28 November 1901 |
| Death Date: | [1] |
| Country: | Portugal |
| Sport: | Equestrian |
| Show-Medals: | yes |
Hélder de Souza Martins (28 November 1901 - 2 February 1957) was a Portuguese horse rider who competed in the 1924 Summer Olympics, the 1928 Summer Olympics and the 1948 Summer Olympics.[2]
In 1924 he and his horse Avro won the bronze medal as part of the Portuguese show jumping team, after finishing twelfth in the individual jumping competition.[2] Four years later he and his horse Avro finished sixth as part of the Portuguese show jumping team, after finishing 16th in the individual jumping competition.[3]