Ostoja of Bosnia
| Stephen Ostoja | |
|---|---|
| King of Bosnia | |
| First reign | 1398–1404 |
| Predecessor | Jelena Gruba |
| Successor | Stephen Tvrtko II |
| King of Bosnia | |
| Second reign | 1409–1418 |
| Predecessor | Stephen Tvrtko II |
| Successor | Stephen Ostojić |
| Died | September 1418 |
| Spouse | Vitača Kujava Radinović Jelena Nelipčić |
| Issue | Stephen Ostojić of Bosnia Radivoj of Bosnia Thomas of Bosnia |
| House | House of Kotromanić |
| Religion | Church of Bosnia |
Stephen Ostoja (Serbo-Croatian: Stjepan Ostoja / Стјепан Остоја; died September 1418) was King of Bosnia from 1398 to 1404 and from 1409 to 1418.