Catlin Township is a township in Vermilion County, Illinois, United States. As of the 2010 census, its population was 3,300 and it contained 1,342 housing units.
Catlin Township was created in 1858.
According to the 2010 census, the township has a total area of , of which (or 99.44%) is land and (or 0.56%) is water.
The township contains fourteen cemeteries: Allhands, Cox, Dougherty, God's Acre, Hickman, Jones Grove, Kight's, Mount Vernon, New Atherton, Oak Ridge, Pate, Songer, Spicer Family Plot and Wright Family.