Theodore Fourmois (14 October 1814 in Presles - October 1871 in Ixelles) was a Belgian landscape painter and printmaker.
Theodore Fourmois learned drawing in the lithographic's workshop of Antoine Dewasme-Pletinckx in Brussels. He first exposed his works in this city in 1836. He began painting landscapes of Ardennes and Campine, several studies and panoramic views while traveling in Dauphine and Switzerland.