John Leslie may refer to:
United Kingdom
Sir John Leslie (physicist) (1766–1832), Scottish mathematician and physicist
John Leslie (TV presenter) (born 1965), Scottish former television presenter
John Leslie (bishop of Clogher) (1571–1671), Church of Scotland and Church of Ireland bishop
John Leslie (bishop of Kilmore, Elphin and Ardagh) (1772–1854), Church of Ireland bishop
John Leslie (cricketer, born 1888), English cricketer and British Army officer
John Leslie (footballer) (born 1955), English footballer
John Leslie (politician) (1873–1955), British Labour Party Member of Parliament for Sedgefield
Sir John Leslie, 1st Baronet (1822–1916), Conservative Member of Parliament for Co. Monaghan, Ireland
Sir John Leslie, 2nd Baronet (1857–1944), Irish landowner and soldier in the British Army
Sir John Leslie, 4th Baronet (1916–2016), officer in the Irish Guards
John Leslie, 1st Duke of Rothes (c. 1630–1681), Scottish nobleman
John Leslie, 6th Earl of Rothes (1600–1641), Scottish nobleman
John Leslie, 10th Earl of Rothes (1698–1767), British Army officer
John Leslie, 11th Earl of Rothes (1744–1773), Scottish nobleman
John Leslie (priest) (1868–1934), Dean of Lismore
Shane Leslie (Sir John Randolph Leslie, 3rd Baronet, 1885–1971), Anglo-Irish soldier and writer
John Leslie of Parkhill, involved in the murder of Cardinal David Beaton in 1546
John Leslie, Lord Newton (1595-1651) Scottish judge and soldier killed at the Siege of Dundee
Other places
John A. Leslie (born 1940), Canadian philosopher
John A. Leslie (Canadian politician), Ontario MPP for York East
John Leslie (1919–2016), patron of Gippsland Art Gallery, Australia
John Leslie (cricketer, born 1814), Irish cricketer and barrister
John Leslie (director) (1945–2010), American porn actor, director and producer
John Leslie (rugby union) (born 1970), New Zealand rugby union footballer who played for Scotland
John Robert Leslie (academic) (1831–1881), Irish academic associated with Trinity College Dublin