|Population||159 (2001 Census)|
|Sovereign state||United Kingdom|
Tullynacross (from Irish: Tulaigh na Croise, meaning 'hillock of the cross') is a small village in County Antrim, Northern Ireland, near Lambeg. In the 2001 Census it had a population of 159 people. It lies within the civil parish of Lambeg, the barony of Castlereagh Upper, and is situated within the Lagan Valley Regional Park and Lisburn and Castlereagh City Council.
A major Coca-Cola owned bottling plant is sited in Tullynacross. Ulster's very own water brand, Deep RiverRock, is bottled there. The plant is adjacent to a lock on the Lagan Canal (also known as the Lagan Navigation).