Gradišče (pronounced [ɡɾaˈdiːʃtʃɛ]; in older sources also Gradiše,[1] Italian: Gradischie[2]) is a formerly independent settlement in the Municipality of Ajdovščina in southwestern Slovenia.

Gradišče lies northwest of Ajdovščina, on the southwest slope of Gradišče Commons Hill (Slovene: Gradiška gmajna, elevation: 215 meters or 705 feet).

[4] Gradišče is a relatively frequent toponym in Slovenia, referring to locations where such fortifications and similar structures stood.

The same sematic motivation is found in related toponyms of Slavic origin: Italian Gradisca d'Isonzo, Romanian Horodiște, Russian Gorodishche, Serbian Gradište, and Ukrainian Horodyshche.

[7] Gradišče was annexed by Ajdovščina in 1953, ending its existence as an independent settlement.