Sir William Augustus Fraser, 4th Baronet of Leadclune (10 February 1826 – 17 August 1898), of Pilton House, near Barnstaple, Devon, was an English politician, author and collector.
He was elected Member of Parliament for Barnstaple (Devon) in 1852, and again in 1857, and for Ludlow (Shropshire) in 1863 and for Kidderminster (Worcestershire) in 1894.