Henry Longueville Mansel (1820 – 1871) was an English philosopher and ecclesiastic. The philosophy of Mansel, like that of William Hamilton, was mainly due to Aristotle, Immanuel Kant and Thomas Reid. Like Hamilton, Mansel maintained the purely formal character of logic, the duality of consciousness as testifying to both self and the external world, and the limitation of knowledge to the finite and "conditioned."