| Full name: | John Morton Leiper |
| Born: | 17th February 1921, Woodford Green, Essex, England |
| Died: | 17th July 2006, Waltham Forest, Essex, England |
| Batting: | Left-hand batter |
| Bowling: | Right-arm fast-medium |
| Occasional wicket-keeper | |
| Education: | Chigwell |
| Clubs: | Woodford Wells |
| Relations: | Brother: WA Leiper; Cousin: HM Leiper; Cousin: JH Leiper; Cousin: AD Leiper; Granddaughter: KN Leiper; Son: RJ Leiper; Son: DA Leiper |
| Teams: | Essex (Main FC: 1950); Essex Second XI (Minor Counties Championship: 1948-1951); All teams |
| Club Cricket Conference cap: 1947 | |
| Lists of matches and more detailed statistics | |
| First-Class Career Batting and Fielding (1950) | ||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | Ct | ||
| Essex | 2 | 4 | 0 | 50 | 44 | 12.50 | 0 | 0 | 1 | |
| First-Class Career Bowling (1950) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 5wI | 10wM | SRate | Econ | |
| Essex | 192 | 5 | 79 | 1 | 1-38 | 79.00 | 0 | 0 | 192.00 | 2.46 |
| Minor Counties Championship Career Batting and Fielding (1948-1951) | ||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | Ct | ||
| Essex Second XI | 6 | 7 | 0 | 298 | 83 | 42.57 | 0 | 3 | 4 | |
| Minor Counties Championship Career Bowling (1948-1951) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 5wI | 10wM | SRate | Econ | |
| Essex Second XI | 888 | 42 | 443 | 21 | 6-52 | 21.09 | 1 | 0 | 42.28 | 2.99 |