Hessen Cassel is an unincorporated community in Marion Township, Allen County, in the U.S. state of Indiana.
Hessen Cassel was platted in 1863. Hessen Cassel was originally built up chiefly by Germans, and was named for the Landgraviate of Hesse-Kassel in Germany.
The United States Census Bureau delineated Hessen Cassel as a census designated place in the 2022 American Community Survey.