Gilbert Thomas 'Bert' Thornley (born 3 September 1942) is a former Australian rules footballer who played with Carlton in the VFL.
Thornley, a defender who could kick with both feet, was recruited to Carlton from East Fremantle Football Club in the Western Australian Football League, and made his VFL debut during the 1967 season.
Selected as a resting forward-pocket rover, Thornley played in the 1970 VFL Grand Final. He was replaced, at half-time, by eventual match hero Ted Hopkins.
He finished his playing career at Preston Football Club in the Victorian Football Association (VFA) before becoming the coach of Torquay.