| Full name: | Ernest James Unwin |
| Born: | 18th September 1912, Baythorne Hall, Birdbrook, Essex, England |
| Died: | 23rd November 2003, Perth, Scotland |
| Batting: | Right-hand batter |
| Bowling: | Right-arm fast-medium |
| Other Sports: | Rugby Union for England, British Lions, Rosslyn Park, Army, Combined Services, London Counties and Eastern Counties |
| Education: | Haileybury College; RMC, Sandhurst |
| Occupation: | Career soldier |
| Relations: | Brother-in-law: DG Lawrence; Brother: FS Unwin; Father-in-law: HM Lawrence |
| Teams: | Essex (Main FC: 1932-1939);
Suffolk (Minor Counties Championship: 1951-1956);
All teams |
| External link: | Jim Unwin's Rugby Union international career and statistics |
| | Jim Unwin's Rugby Union British & Irish Lions career and statistics |
| Lists of matches and more detailed statistics |