World War I is remembered and commemorated by various war memorials, including civic memorials, larger national monuments, war cemeteries, private memorials and a range of utilitarian designs such as halls and parks, dedicated to remembering those involved in the conflict. Huge numbers of memorials were built in the 1920s and 1930s, with around 176,000 erected in France alone. This was a new social phenomenon and marked a major cultural shift in how nations commemorated conflicts. Interest in World War I and its memorials faded after World War II, and did not increase again until the 1980s and 1990s, which saw the renovation of many existing memorials and the opening of new sites. Visitor numbers at many memorials increased significantly, while major national and civic memorials continue to be used for annual ceremonies remembering the war.

The Cross of Sacrifice is a Commonwealth war memorial designed in 1918 by Sir Reginald Blomfield for the Imperial War Graves Commission. It is present in Commonwealth war cemeteries containing 40 or more graves. Its shape is an elongated Latin cross with proportions more typical of the Celtic cross, with the shaft and crossarm octagonal in section. It ranges in height from 18 to 24 feet. A bronze longsword, blade down, is affixed to the front of the cross. It is usually mounted on an octagonal base. It may be freestanding or incorporated into other cemetery features. The Cross of Sacrifice is widely praised, widely imitated, and the archetypal British war memorial. It is the most imitated of Commonwealth war memorials, and duplicates and imitations have been used around the world.