F42

F42 may refer to:


 * F42 (classification), a disability sport classification
 * F-42 (Michigan county highway)
 * BRAZILIAN FRIGATE Constituição, a Niterói-class frigate of the Brazilian Navy
 * HMS Laconia (F42), a Cunard ocean liner requisitioned for the Royal Navy
 * HMS Phoebe (F42), a Leander-class frigate of the Royal Navy
 * INS Vindhyagiri (F42), a Nilgiri-class frigate of the Indian Navy
 * Obsessive-compulsive disorder
 * Samsung Galaxy F42 5G, a smartphone