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
See also F9 (disambiguation) February 9 9ff, a German car tuning company Grumman F9F Panther, an American carrier-based fighter aircraft Grumman F9F Cougar, an American carrier-based fighter aircraft