HMS Ramillies was one of five Revenge-class super-dreadnought battleships built for the Royal Navy during the First World War. They were developments of the Queen Elizabeth-class battleships, with reductions in size and speed to offset increases in the armour protection whilst retaining the same main battery of eight 15-inch (381 mm) guns. Completed in late 1917, Ramillies saw no combat during the war as both the British and the German fleets had adopted a more cautious strategy by this time owing to the increasing threat of naval mines and submarines.

The Revenge class, sometimes referred to as the Royal Sovereign class or the R class, consisted of five Dreadnought battleships built for the Royal Navy in the 1910s. All of the ships were completed to see service during the First World War. There were originally to have been eight of the class, but two were later redesigned, becoming the Renown-class battlecruisers, while the other, which was to have been named HMS Resistance, was cancelled outright. The design was based on that of the preceding Queen Elizabeth class, but with reductions in size and speed to make them more economical to build.