William Thomas Harrison (22 September 1837 – 11 December 1920) was an Anglican bishop.

His father was the Reverend Thomas T. Harrison, rector of Thorpe Morieux.

[3] Harrison was ordained deacon in 1861 and priest in 1862 by the Bishop of Norwich.

After a curacy in Great Yarmouth between 1861 and 1864, he became rector of his father's former parish, serving until 1875.

Harrison was elected as the fourth Bishop of Glasgow and Galloway in 1888 and was consecrated on 29 September 1888.