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is a civil township of Otsego County in the U.S. state of Michigan. The population was 2,532 at the 2000 census. The township takes its name from Otsego Lake, the southern half of which is within the township. Otsego Lake State Park is on the southeast shore of the lake in the township.
According to the United States Census Bureau, the township has a total area of 35.5 square miles (91.9 km²), of which, 32.7 square miles (84.8 km²) of it is land and 2.8 square miles (7.1 km²) of it (7.75%) is water.