Fidelity Township is one of eleven townships in Jersey County, Illinois, United States.

As of the 2010 census, its population was 715 and it contained 309 housing units.

[2] According to the 2010 census, the township has a total area of 36.18 square miles (93.7 km2), of which 36.11 square miles (93.5 km2) (or 99.81%) is land and 0.07 square miles (0.18 km2) (or 0.19%) is water.

[2] The township contains these five cemeteries: Chapman, Longwill, Luckey-Weber, Moore and Trible.