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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 Gordon | as Cabbie #1 (uncredited) | |
| The Man Without a Country | 1937 | · | as Lt. Philip Nolan | as Minor Role (uncredited) |
| 1938 | 7.0 | as Jean La Cour | as Jenkins (uncredited) | |
| My Bill | 1938 | · | as John C. Rudlin | as Bank Clerk (uncredited) |
| 1938 | 7.0 | as Mr. Monroe, Prosecuting Attorney | as Alarm Company Operator (uncredited) | |
| The Declaration of Independence | 1938 | · | as Thomas Jefferson | as Rodney's Messenger (uncredited) |
| Secret Service of the Air | 1939 | · | as Chief Agent Tom Saxby | as Agent Cliff Durell |
| 1939 | 5.8 | as Attorney Carey | as Convict Remaining in Cell (uncredited) | |
| Nancy Drew... Trouble Shooter | 1939 | · | as Carson Drew | as Greenhouse Clerk |
| On Dress Parade | 1939 | · | as Col. Michael Riker | as Academy Officer Investigating Fracas (uncredited) |
| 1939 | 6.0 | as Dr. Flegg | as Reporter (uncredited) | |
| 1940 | 5.8 | as Captain Mangan | as Carrol (uncredited) | |
| 1940 | 6.3 | as Marshall | as Union Lieutenant (uncredited) |