Tullynacross (from Irish Tulaigh na Croise, meaning 'hillock of the cross')[1] is a small village in Lisburn, County Antrim, Northern Ireland, near Lambeg.

It lies within the civil parish of Lambeg, the barony of Castlereagh Upper, and is situated within the Lagan Valley Regional Park.

The local authority is Lisburn and Castlereagh City Council.

A major Coca-Cola owned bottling plant is sited in Tullynacross.

This article related to the geography of County Antrim, Northern Ireland is a stub.