The Sidlesham War Memorial is a grade II listed structure. It is located within the churchyard and consists of a squat obelisk on a square plinth. It is set within a small kerbed enclosure. It was originally constructed in the 1920s to commemorate the 20 Sidlesham people who lost their lives in the First World War. There is an addition, dedicated in 1948, to the 20 who lost their lives in the Second World War.

On the Sunday nearest the 11 November we meet at the war memorial at 11am to remember the fallen. This year because of government restrictions it is not possible.

On the scroll tablet it says:

• SACRED TO THE MEMORY OF THE MEN OF THIS PARISH WHO FELL IN THE GREAT WAR 1914 - 1918
• THEY DIED THAT WE MIGHT LIVE

On the tablet, in front it says:

• AND TO THE MEMORY OF THE MEN AND WOMEN OF THIS PARISH WHO MADE THE GREAT SACRIFICE 1939 - 1945
• AT THE GOING DOWN OF THE SUN AND IN THE MORNING/ WE WILL REMEMBER THEM