John Liddell (31 March 1879 – 20 February 1928), better known as Jack Palmer, was an English heavyweight boxer.

Born in Newcastle upon Tyne, Palmer was a miner before taking up boxing professionally.

In April 1902 he beat Joe White to take the English 158 lbs middleweight title.

He fought Jack Twin Sullivan later that month in a bout billed as a 158 lbs world heavyweight title fight, drawing over 15 rounds.

[3] In February 1908 he fought Tommy Burns for the World Heavyweight title, losing to a fourth-round knockout.