F61

F61 may refer to:
 * Farman F.61, a French reconnaissance aircraft
 * HMS Javelin (F61), a J-class destroyer of the Royal Navy
 * HMS Llandaff (F61), a Salisbury-class frigate of the Royal Navy
 * HMS Pretoria Castle (F61) an ocean liner requisitioned for the Royal Navy
 * Northrop F-61 Black Widow, an American fighter aircraft