Orešje (pronounced [ɔˈɾeːʃjɛ], German: Oreschie,[2] Italian: Oressia[3]) is a formerly independent settlement in the Municipality of Ajdovščina in southwestern Slovenia.

Orešje is a clustered village on a lee slope of a karst plateau where the road from Ajdovščina splits to Črni Vrh to the northeast and Podkraj to the southeast.

[1] Like similar place names in Slovenia (e.g., Orehovica, Orehovec, Orehovlje, etc.

), the name Orešje is based on the root oreh 'walnut', thus referring to the local vegetation.

[1] Orešje was annexed by Col in 1971, ending its existence as an independent settlement.