John Hartley, English tennis player (b. 1849)
Rev. 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 Gentlemans Singles title against Irish champion, Vere St. Leger Goold in three sets on 15 July, retaining his title the following year, 1880, by defeating Herbert Lawford in the Challenge Round, 6–3, 6–2, 2–6, 6–3.

Hartley lost in 37 minutes in the 1881 Gentleman's Singles final, to William Renshaw, 0–6, 1–6, 1–6. This was the shortest final on record and it was reported that Hartley was suffering from an attack of 'English cholera'. Hartley did not compete in the 1882 championships and made a final return at the 1883 championships, losing in the second round to Herbert Wilberforce in four sets.

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