| Sigismund Casimir | |
|---|---|
 | |
| Born | 1 April 1640 Kraków, Poland |
| Died | 9 August 1647 (aged 7) Nevers, France |
| Burial | |
| House | Vasa |
| Father | Władysław IV of Poland |
| Mother | Cecilia Renata of Austria |
Sigismund Casimir Vasa (Polish: Zygmunt Kazimierz Waza; 1 April 1640 – 9 August 1647), was a Polish prince and the only legitimate son of King Wladislaus IV and his first wife Queen Cecilia Renata. He was named after his grandfather Sigismund III, and uncle John Casimir.