Slieve True or Slievetrue () is a hill in County Antrim, Northern Ireland. It is near Knockagh Monument and Monkstown, about north of Belfast.
Slieve True derives its name from three standing stones (known as "The Three Brothers") about southwest of the summit. These have since been integrated into a field wall. There is also a cairn in the area.
In May 2013, Irish electricity company Gaelectric opened a wind farm in the Carn Hill area of Slievetrue, consisting of six wind turbines at a total cost of ã20 million.