Chadderton (pop. 34,818) is a town within the Metropolitan Borough of Oldham, in Greater Manchester, England. It lies along the course of the River Irk and the Rochdale Canal, on undulating land in the foothills of the Pennines, 1 mile (1.6 km) west of Oldham, 4.5 miles (7.2 km) south of Rochdale, and 6 miles (9.7 km) northeast of the city of Manchester.