Cassella is an unincorporated community in Marion Township, Mercer County, Ohio, United States.
[1] Situated at the intersection of State Route 119 and Cassella-Montezuma Road in western Marion Township, it lies in the headwaters of Beaver Creek to the south of the city of Celina,[2] the county seat of Mercer County.
[2] Cassella lies in the Land of the Cross-Tipped Churches, a heavily Catholic region of rural far western Ohio that centers on Maria Stein.
[4] It grew up around the Nativity of the Blessed Virgin Mary Catholic Church, which was founded in 1847 and built its present building in 1858.
[5] Today, Cassella remains a small community centered on Nativity Catholic Church.