| Ernest Vaast | |
| Fullname: | Ernest Vaast |
| Birth Date: | 28 October 1922 |
| Birth Place: | Paris, France |
| Position: | Midfielder |
| Years1: | ?–1944 |
| Clubs1: | FC Levallois |
| Years2: | 1944–1949 |
| Clubs2: | RC Paris |
| Years3: | 1949–1950 |
| Clubs3: | Servette |
| Years4: | 1950–1951 |
| Clubs4: | RC Paris |
| Years5: | 1951–1953 |
| Clubs5: | Rennes |
| Years6: | 1953–1954 |
| Clubs6: | Red Star |
| Nationalyears1: | 1945–1949 |
| Nationalteam1: | France |
| Nationalcaps1: | 15 |
| Nationalgoals1: | 11 |
| Manageryears1: | 1956–1959 |
| Managerclubs1: | AS Cherbourg |
| Manageryears2: | 1968–1970 |
| Managerclubs2: | Rodez AF |
Ernest Vaast (28 October 1922 – [1]) was a French international football midfielder. He scored 11 goals in 15 matches for France and was a main player at RC Paris.