This is a listing of all Marine Observation Squadrons from 1943 to 1994. Click the link to go to that squadron's page.
| Squadron | Dates | Comments |
|---|---|---|
| VMO-1 | 1944-93 | Deactivated |
| VMO-2 | 1944-46; 1952-93 | Inactive 1946-52; deactivated |
| VMO-3 | 1944-49; 1966-68 | Inactive 1949-66; redesignated HML-367 |
| VMO-4 | 1944-45; 1962-94 | Inactive 1945-62 |
| VMO-5 | 1944-45; 1966-68 | Inactive 1945-66; redesignated HML-267 |
| VMO-6 | 1944-77 | Deactivated |
| VMO-7 | 1944-45 | Deactivated |
| VMO-8 | 1944-45; 1968-76 | Inactive 1945-68; deactivated |
| (ASD)VMO-155 | 1943-44 | Redesignated VMO-1 |
| (ASD)VMO-251 | 1843-44 | Redesignated VMO-2 |
| (ASD)VMO-351 | 1943-44 | Redesignated VMO-3 |
| (ASD)VMO-951 | 1943-44 | Redesignated VMO-4 |
| VMO-951 | 1944 | Existed for 3 weeks; deactivated |