League One or League 1 may refer to:
Association football
EFL League One, the third tier of football in England. China League One, the second tier of football in China K League 1, the top-tier football in South Korea Lao League 1 League1 British Columbia, semi-professional regional league in Canada League1 Ontario, semi-professional regional league in Canada League1 Ontario (women), semi-professional women's regional league in Canada Scottish League One, the third tier of football in Scotland Thai League 1, the top tier of football in Thailand USL League One, a third-tier soccer league in the United States
Rugby
RFL League One, the third tier of rugby league in Europe National League 1, the third tier of rugby union in England
See also
Ligue 1, the top tier professional football league in France Ligue 1 (disambiguation) Division 1 (disambiguation)