Gille Brigte of Strathearn (1150–1223), sometimes also called Gilbert, is the 3rd Earl or Mormaer of Strathearn. The eldest of three children born to Ferteth, Earl of Strathearn and his wife Ethen, he first appears on record in 1164, as a witness to a charter by King William to the monks of Scone. He succeeded his father in 1171, and around this time was made Justiciar of Scotia, the highest legal official in the realm. Gille Brigte (Gilbert) died in 1223, perhaps in his 70s, a very long life for the period, a testimony to his comparatively peaceful career.