HMS Uproar (P31) was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness.

Uproar spent most of the war operating in the Mediterranean as part of the 10th flotilla, using Malta as a base.

She was damaged whilst in port by an air raid, and required repairs before continuing operations.

Uproar was subsequently attacked by depth charges from the Italian torpedo boats Cigno and Procione.

Other targets included the German (former French) tanker Champagne, which ran aground off Bastia, Corsica, France after being torpedoed on the 24th by HMS Ultor.