John Baptist Butt (20 April 1826 – 1 November 1899) was an English prelate who served as the fourth Roman Catholic Bishop of Southwark[1] from 1885 to 1897.

Born in Richmond, Surrey, Butt was ordained to the priesthood by Bishop Nicholas Wiseman, Vicar Apostolic of the London District on 15 July 1849.

[3] He was consecrated by Arthur Riddell, Bishop of Northampton on 29 January 1885, with bishops William Vaughan and John Vertue serving as co-consecrators.

[4] He founded St John's Seminary, Wonersh, near Guildford, Surrey in 1889, and employed as his first rector the young priest Francis Bourne, later to become Cardinal Archbishop of Westminster.

[3] He died in Arundel[1] on 1 November 1899, aged 73,[3] and was buried at St John’s Seminary in Wonersh.