Séamus "Sé" O'Hanlon also known as Shay O'Hanlon (born 14 September 1941 in Dublin, Ireland) is a former Irish amateur road racing cyclist. He was a top amateur in Ireland in the 1960s and 1970s, winning the Rás Tailteann stage race in 1962, 1965, 1966 and 1967. O'Hanlon belonged to the National Cycling Association (NCA), one of the three cycling associations in Ireland at that time and the one whose members were excluded by the UCI from world championships and Olympic Games.