9F

9F or 9-F may refer to:

Locomotives

 * BR Standard Class 9F, a class of 2-10-0 steam locomotives
 * BR Standard Class 9F 92020-9
 * BR Standard Class 9F 92220 Evening Star
 * List of preserved BR Standard Class 9F locomotives
 * GCR Class 9F, a class of 0-6-2T steam locomotives

Other uses

 * 2020 Salvadoran political crisis, commonly referred to as 9F (9 February)
 * New York Route 9F, now New York State Route 9G
 * Fluorine (9F), a chemical element