Washington Township is a township in Crawford County, Kansas, United States. As of the 2020 census, its population was 3,519.
Washington Township covers an area of and contains two incorporated settlements, Arma, and the larger Frontenac. According to the USGS, it contains five cemeteries: Frontenac City Cemetery located within the City of Frontenac; Sacred Heart Catholic Cemetery, also located within the Frontenac city limits; Garden of Memories, located three miles north of Frontenac on US 69 Hwy; Lone Star, Rosebank, Smilie and Union Center all located in rural areas.
Washington Township contains two airports or landing strips: Galichia Airport and Youvan Airport.