Clairmarais aerodrome (also known as Clairmarais North, not to be confused with the newer Clairmarais South), at Clairmarais, Pas-de-Calais, France, near St. Omer and not far from Ypres, was an airfield used by the Royal Flying Corps (RFC) and later Royal Air Force (RAF) in the First World War. The site was briefly reused by the Germans during the occupation of France in the Second World War.