Clearcreek Township is one of the eleven townships of Warren County, Ohio, United States, located in the north central portion of the county. It had a population of 20,974 in 2000, up from 13,344 in 1990; of this total, 8,747 lived in the unincorporated portions of the township. It was originally about forty-two square miles in area. The highest point in the county is in Clearcreek Township, near the community of Five Points. Statewide, the only other Clearcreek Townships are located in Fairfield County and in Ashland County.
Located in the northern part of the county, it borders the following townships:
Much of the western portion of the township has been annexed by the city of Springboro.
The township is governed by a three-member board of trustees, who are elected in November of odd-numbered years to a four-year term beginning on the following January 1. Two are elected in the year after the presidential election and one is elected in the year before it. There is also an elected township fiscal officer, who serves a four-year term beginning on April 1 of the year after the election, which is held in November of the year before the presidential election. Vacancies in the fiscal officership or on the board of trustees are filled by the remaining trustees.
Most of the township is in the Springboro Community City School District, but a large portion in the south central section is in the Lebanon City School District. Portions are also in the Franklin and Wayne school districts. The Springboro, Lebanon, Centerville and Waynesville post offices serve the township and it lies in the Franklin, Lebanon, Waynesville, Miamisburg, and Centerville telephone exchanges.