Sir Kingsmill James Key, 4th Baronet (11 October 1864 – 9 August 1932) was an English cricketer.

[5] He died at the age of 67 in Wittersham, Kent, having contracted blood poisoning after an insect bite.

[6] His cousin, Leslie Gay, played one Test match for England.

Leslie's sister, Charlotte Evelyn Gay, was an English social and temperance reformer affiliated with the Church Army.

This biographical article related to an English cricket person born in the 1860s is a stub.