Mars Mill was a former cotton spinning mill in Castleton, Rochdale, Greater Manchester, England. Castleton joined the Borough of Rochdale in 1899. Queensway, Castleton was a hub of cotton mills; Mars, Marland, and Castleton Mill were a group of three. It was taken over by the Lancashire Cotton Corporation in 1935 and passed to Courtaulds in 1964 and demolished in the 1990s; Marland survived until 2004.