William Kearsley (2 September 1863 – 19 June 1921) was an Australian politician and member of the New South Wales Legislative Assembly from 1910 until 1921.
He was educated to be a Methodist minister and emigrated to the northern New South Wales coal fields in 1888.
He was elected unopposed to the seat of Northumberland at a by-election caused by the resignation of Matthew Charlton who contested the seat of Hunter at the 1910 federal election.
He retained the seat of Northumberland until it was abolished at the 1913 state election.
He died in the following year and was replaced by David Murray.