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is a civil township of St. Clair County in the U.S. state of Michigan. The population was 6,966 at the 2000 census. The township was created in 1837 and was named for Ira Marks, an early settler. A post office named Ira was established at a settlement on the north shore of Lake St. Clair in May 1851 and operated until June 1853.
According to the United States Census Bureau, the township has a total area of 21.6 square miles (55.9 km²), of which, 17.0 square miles (43.9 km²) of it is land and 4.6 square miles (12.0 km²) of it (21.42%) is water.
Ira township is flat and rises slightly from the shoreline of Lake Saint Clair. Most of the township is rural and made up of woods, open space and farms. The shoreline is developed along the Dixie Hwy which hugs the shore and there are small clusters of homes at Fair Haven and Anchorville. There is a small industrial are in the north west section of the township as well. The primary tributaty which is centered geographically is the Swan Creek which brances off to the east and west out north of the township limits. The drainage area of these creeks is small but makes up most of the townships watershed. The shoreline is often sandy or has seawalls along private homes and the water is shallow near the land. There are a number of marshes in the township along the lake and the creeks.