F45

F45 may refer to:

Ships

 * BRAZILIAN FRIGATE União, a Niterói-class frigate of the Brazilian Navy
 * HMS Hector (F45), an armed merchant cruiser of the Royal Navy
 * HMS Khartoum (F45), a K-class frigate of the Royal Navy
 * HMS Minerva (F45), a Leander-class frigate of the Royal Navy
 * INS Teg (F45), a Talwar-class frigate of the Indian Navy

Aircraft and Airports

 * Firecatcher F-45, a single-turboprop aircraft designed for aerial firefighting, air freight and commuter airlines.
 * Fairchild 45, a rare American 1930s vintage aircraft
 * North Palm Beach County General Aviation Airport, in Florida (location identifier: F45)

Other uses

 * BMW 2 Series (F45), an automobile
 * EMD F45, an American diesel-electric locomotive
 * F45 Training, an Australian multinational chain of fitness clubs
 * Somatic symptom disorder (medical classification code: F45)