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). Haller also competed in two Summer Olympics, earning his best finish of fourth in the C2 event in Barcelona in 1992. In 1996 he was ranked Number 1 in the world for men's C2.