| Ian Harrison | |
| Birth Date: | 1919 |
| Death Date: | 2 April 2008 |
| Allegiance: | United Kingdom |
| Branch: | Royal Marines |
| Rank: | Major general |
| Commands: | 40 Commando (1959–61) |
| Battles: | Second World War |
| Awards: | Companion of the Order of the Bath |
| Laterwork: | Captain of Deal Castle (1980–09) |
Major General Ian Stewart Harrison (1919 – 2 April 2008) was a senior Royal Marines officer who served as Captain of Deal Castle from 1980 to 2009 before the positions abolition. Harrison was commissioned into the Royal Marines in 1937, and commanded 40 Commando from 1959 to 1961.