Ostap () is a Ukrainian male given name. It derives from the Greek name Eustathius.
People with this name include:
- Ostap Bender, a fictional character from the Russian novel The Twelve Chairs
- Ostap Dashkevych (ca. 1495âÂÂ1535), commander of the Ukrainian Cossacks
- Ostap Ortwin (1876âÂÂ1942), Polish journalist
- Ostap Steckiw (1924âÂÂ2001), Polish-born Canadian soccer player
- Ostap Veresai (1803âÂÂ1890), Ukrainian minstrel
- Ostap Vyshnya (1889âÂÂ1956), Ukrainian writer, satirist, and medical official