The Fort de Seclin, also known as Fort Duhoux, is located near the commune of Seclin, France, about south of Lelle. Built from 1873 to 1875, it is part of the Séré de Rivières system of fortifications that France built following the defeat of the Franco-Prussian War. It was never modernized to cope with improvements in artillery technology in the late 19th century. It has been preserved and is interpreted by a local preservation association for the public.