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John Harron averages 6.48 across 16 rated films as an actor, ahead of John Litel at 6.42.
Dot size shows audience votes. Films below the source vote floor sit on the baseline.
| 1937 | 6.6 | as Cabbie #1 (uncredited) | as Gordon | |
| The Man Without a Country | 1937 | · | as Minor Role (uncredited) | as Lt. Philip Nolan |
| 1938 | 7.0 | as Jenkins (uncredited) | as Jean La Cour | |
| My Bill | 1938 | · | as Bank Clerk (uncredited) | as John C. Rudlin |
| 1938 | 7.0 | as Alarm Company Operator (uncredited) | as Mr. Monroe, Prosecuting Attorney | |
| The Declaration of Independence | 1938 | · | as Rodney's Messenger (uncredited) | as Thomas Jefferson |
| Secret Service of the Air | 1939 | · | as Agent Cliff Durell | as Chief Agent Tom Saxby |
| 1939 | 5.8 | as Convict Remaining in Cell (uncredited) | as Attorney Carey | |
| Nancy Drew... Trouble Shooter | 1939 | · | as Greenhouse Clerk | as Carson Drew |
| On Dress Parade | 1939 | · | as Academy Officer Investigating Fracas (uncredited) | as Col. Michael Riker |
| 1939 | 6.0 | as Reporter (uncredited) | as Dr. Flegg | |
| 1940 | 5.8 | as Carrol (uncredited) | as Captain Mangan | |
| 1940 | 6.3 | as Union Lieutenant (uncredited) | as Marshall |