The 207th (Carleton) Battalion, CEF was a battalion of the First World War Canadian Expeditionary Force. It was organized at Ottawa by Lt Col Charles Wesley MacLean with members recruited by the 43rd Regiment "Duke of Cornwall's Own Rifles" and volunteers from Carleton County and environs beginning in February 1916. Initial training was conducted at Rockcliffe Camp at which time the battalion earned its unofficial nickname "MacLean's Athletes" due to its participation in sports, especially rugby and baseball. Additional training was done at Amherst N. S. from January 1917; the battalion sailed from Halifax with a strength of 27 officers and 652 men on June 2, 1917.