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| Diana Fowley | |
| Continuity: | The X-Files |
| Notability: | Recurring character |
| Occupation: | Federal agent |
| Gender: | Female |
| Race: | Human |
| Location: | Washington, D.C. |
| Status: | Deceased |
| Died: | 1999 |
| First: | "The End" |
| Final: | "The Sixth Extinction II: Amor Fati" |
| Actor: | Mimi Rogers |
Diana Fowley is a fictional Federal agent and a recurring character featured on the FOX Network television series The X-Files. Played by actress Mimi Rogers, she was introduced in the twentieth episode of season five titled, "The End". She made four more appearances in the show in season six, and two appearances in season seven.