Theodor "Theo" Nüsing (born May 7, 1950 in Zons) is a West German retired slalom canoeist who competed in the 1970s. He won a silver medal in the C-2 team event at the 1971 ICF Canoe Slalom World Championships in Meran. Nüsing also finished ninth in the C-2 event at the 1972 Summer Olympics in Munich.