F51
# F51

F51 most often refers to:

F51 may also refer to:

* Farman F.51, a French maritime reconnaissance flying boat
* HMS Ashanti (F51), a Tribal-class destroyer of the Royal Navy
* HMS Grafton (F51), a Blackwood-class frigate of the Royal Navy
* HMS Laurentic (F51), an armed merchant cruiser of the Royal Navy
* INS Trikand (F51), a Talwar-class frigate of the Indian Navy
* Nonorganic sleep disorder
