Mercer is a village in the Waikato District Council area of the Waikato region of the North Island of New Zealand. It is 70 km north of Hamilton and 58 km south of Auckland, on the east bank of the Waikato River, 2 km south of its confluence with the Mangatāwhiri River. Prior to the creation of the Auckland supercity in 2010, Mercer was in Franklin District, part of the Auckland Region.