| Birth Date: | 4 January 1890 |
| Birth Place: | Antwerp, Belgium |
| Death Place: | Antwerp, Belgium |
| Sport: | Water polo |
Léon Pierre Nijs (4 January 1890 - 12 June 1939) was a Belgian water polo player who competed in the 1912 Summer Olympics and in the 1920 Summer Olympics. He was part of the Belgian team and was able to win a silver and a bronze medal.[1] He was born, and died, in Antwerp.