John Lyon
John or Jack Lyon may refer to:
- John Lyon Scottish botanist and plant
- John Lyon , English boxer
- John Lyon , British Parliamentary Commissioner for Standards
- John Lyon , cricketer for Lancashire
- John Lyon, Lord of Glamis, Chamberlain of Scotland
- John Lyon, 1st Master of Glamis, see Earl of Strathmore and Kinghorne
- John Lyon, 3rd Lord Glamis
- John Lyon, 4th Lord Glamis
- John Lyon, 6th Lord Glamis
- John Lyon, 7th Lord Glamis,
- John Lyon, 8th Lord Glamis, Scottish nobleman, judge and Lord High Chancellor of Scotland
- John Lyon , English founder of Harrow School
- John Lyon, 4th Earl of Strathmore and Kinghorne
- John Lyon, 5th Earl of Strathmore and Kinghorne
- John Lyon , Scottish LDS poet
- John Herbert Bowes-Lyon
- John Bowes, 9th Earl of Strathmore and Kinghorne, born John Lyon
- John Lyon, name of several people of Clan Lyon in Scotland
- John Lyon, the real name of singer Southside Johnny
- Jack Lyon, New Zealand politician
- Jack Lyon , English footballer