Neshannock Township is a township in Lawrence County, Pennsylvania, United States. The population was 9,609 at the 2010 census.

According to the United States Census Bureau, the township has a total area of 17.4 square miles (45.0 km²), of which 17.3 square miles (44.9 km²) is land and 0.1 square miles (0.2 km²), or 0.34%, is water. The word Neshannock means "land between two waters".

As of the census of 2000, there were 9,216 people, 3,810 households, and 2,724 families residing in the township. The population density was 531.9 people per square mile (205.3/km²). There were 3,978 housing units at an average density of 229.6/sq mi (88.6/km²). The racial makeup of the township was 98.17% White, 0.34% African American, 0.11% Native American, 1.03% Asian, 0.01% Pacific Islander, 0.01% from other races, and 0.34% from two or more races. Hispanic or Latino of any race were 0.42% of the population...

There were 3,810 households out of which 25.5% had children under the age of 18 living with them, 62.6% were married couples living together, 6.9% had a female householder with no husband present, and 28.5% were non-families. 27.0% of all households were made up of individuals and 17.9% had someone living alone who was 65 years of age or older. The average household size was 2.36 and the average family size was 2.86.