1991 is a year in the 20th century.
- February: The Persian Gulf War, code-named Operation Desert Storm by the U.S. military, is fought between Saddam Hussein's Iraq and an international coalition led by the United States. (TXF: "Providence")
- September 20: In Kroner, Kansas, it rains rose petals, thanks to the powers of Holman Hardt. (TXF: "The Rain King")
- October: Events surrounding Anita Hill begin to lose steam. (TXF: "Musings of a Cigarette-Smoking Man")
- December: The Rodney King trial is moved to the Simi Valley in California. (TXF: "Musings of a Cigarette-Smoking Man")
- The Luther Stapes Center for Reproductive Medicine in San Francisco, California sends the files of Claudia Simmons and Joel Simmons to their doctor in Greenwich, Connecticut. (TXF: "Eve")
- The USS Ardent destroyer escort is launched by the US Navy. (TXF: "Dod Kalm")
- FBI Special Agent Fox Mulder unofficially begins working on the X-Files. (TXF: "The End")
- Special Agent Diana Fowley is assigned to the FBI's Foreign Counter-Terrorism Unit in Europe. (TXF: "One Son")
- The Falls at Arcadia housing development is built in San Diego, California. (TXF: "Arcadia")
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