The aftermath of the First World War saw the biggest single wave of public commemoration with tens of thousands of memorials erected across England. One such memorial was raised at the Church of the Annunciation on Bryanston Street as a permanent testament to the sacrifice made by the members of the local community who lost their lives in the First World War. The Marylebone War Memorial commemorates 69 local servicemen who died during the First World War.

The memorial was dedicated around 1920. The design is by Sir Walter Tapper, a British architect known for his Gothic Revival churches, including the Church of the Annunciation (Grade II*) built in 1912. Sir Walter Tapper FRIBA RA (1861-1935) was elected RIBA President from 1927 to 1929 and from 1928 was Surveyor to the Fabric of Westminster Abbey. He was responsible for many listed buildings including a number of churches, such as the Grade II-listed Church of the College of the Resurrection, Mirfield, West Yorkshire and several war memorials including the Grade II-listed cross at Lancaster Gate, London. He was knighted in 1935 for his services in the restoration of the royal chapels.

Set within its original well-executed corner enclosure, the Marylebone War Memorial has an elegant and striking teak Calvary cross and a gilded figure of Christ on a Portland stone plinth. There are two Portland stone plaques on the wall of the church behind, listing the names of the fallen.

The memorial is an eloquent witness to the tragic impact of world events on the local community, and the sacrifice it made in the First World War.