La Chapelle-du-Lou (; ; Gallo: La Chapèll-du-Lóc) is a former commune in the Ille-et-Vilaine department of Brittany in northwestern France. On 1 January 2016, it was merged into the new commune La Chapelle-du-Lou-du-Lac.
People from La Chapelle-du-Lou are called in French Chapellois.