Margaretta Township is one of the nine townships of Erie County, Ohio, United States. It is part of the Sandusky, Ohio metropolitan statistical area. As of the 2020 census the population was 5,640.

Erie County is a county in the northern portion of the U.S. state of Ohio. As of the 2020 census, the population was 75,622. Its county seat and largest city is Sandusky. The county is named for the Erie tribe, whose name was their word for "wildcat". It was formed in 1838 from the northern third of Huron County and a portion of Sandusky County.