League One

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 1, the third tier of rugby league in Europe
 * National League 1, the third tier of rugby union in England