Colonel Sir John Leslie, 2nd Baronet, CBE, JP, DL (7 August 1857 – 25 January 1944) was a British Army officer and landowner.

[2] He was the only son of Sir John Leslie, 1st Baronet, and Lady Constance Wilhelmina Frances Dawson-Damer, sister of the 4th Earl of Portarlington.

[2] Leslie was commissioned into the Grenadier Guards, with whom he served as a lieutenant at the Battle of Tel el Kebir in 1882, distinguishing himself under fire.

[8] In his second autobiographical book, Lionel recounted various anecdotes about his immediate family and their home at Castle Leslie in County Monaghan.

[14] Sir John Leslie died in Glaslough, County Monaghan in Ireland on 25 January 1944.