Jacob Alexander "Lecky" Haller (born 2 August 1957 in Glencoe, Maryland) is an American slalom canoeist who competed from the early 1980s to the early 2000s. He won four medals at the ICF Canoe Slalom World Championships with a gold (C2: 1983), two silvers (C2: 1987, C2 team: 1983) and a bronze (C2 team: 1985).