John Thorneycroft Hartley (9 January 1849 – 21 August 1935) was a tennis player from England, and the only clergyman to win Wimbledon.

Hartley won the 1879 Gentlemen's Singles title against Irish champion, Vere St. Leger Goold in three sets on 15 July,[1] retaining his title the following year, 1880, by defeating Herbert Lawford in the Challenge Round in four sets.

In 1926, at the Golden Jubilee championships, Hartley was presented with a silver medal by Queen Mary, as one of 34 surviving champions.

His parents were both of south Staffordshire industrial business families, his father's family owned the glass making firm of Hartley Chance & Company of Smethwick, while the Thorneycrofts founded Shrubbery Ironworks in Wolverhampton, in which his father became a partner.

Hartley became the vicar of Burneston, Yorkshire,[4] from 1874 to 1919 Rural Dean of East Catterick from 1891 to 1917 and Honorary Canon of Ripon Cathedral from 1905.