HMS Upright was a British U-class submarine, of the second group of that class, built by Vickers Armstrong, Barrow-in-Furness.

So far she has been the only ship of the Royal Navy to bear the name Upright.

Upright spent most of her career operating in the Mediterranean, where she sank the Italian submarine chaser Albatros, Italian merchants Silvia Tripcovich, and Fabio Filzi and Carlo del Greco, which were transporting the M13/40 tanks of the XII Tank Battalion M13/40 of the 133rd Tank Infantry Regiment to Libya.

Upright was heavily depth charged by the escorts, following the attack.

[1] Nevertheless, Upright survived the war, and was sold to be broken up for scrap on 19 December 1945.