Division 1 or Division One may refer to:

• Azadegan League, the second-tier professional football league in Iran
• Brisbane Premier League Division 1, the second-tier professional football league in Brisbane, Queensland, Australia
• Danish 1st Division, of the Danish football league system
• Division 1 (Guernsey), the second-tier football league in the Channel Island Guernsey
• Division 1 (Swedish football), now Ettan Football, the third-tier football league in Sweden
• Football League First Division, the former top division of the English football league system
• Hong Kong First Division League, the second-tier football league in Hong Kong
• I liga, the second-tier football league in Poland
• J1 League, Japan Professional Football League
• League of Ireland First Division, the top-flight division of the Irish football league system
• Ligue 1, the top-flight division of the football league system in France
• The Saudi First Division League, the second-tier football league in Saudi Arabia
• Scottish Football League First Division, the now-defunct second-tier football league in Scotland from 1975 to 2013
• Thai Division 1 League, the second-tier football league in Thailand
• UAE First Division League, the second-tirer football league in United Arab Emirates
• Victorian State League Division 1, the second-tier soccer league in Victoria, Australia
• Welsh Football League Division One, the former top division of the Welsh football league system

• Division 1 (bandy), the third tier of the Swedish bandy league system
• Division 1 (Swedish women's football)
• Division I (NJCAA)
• Division I (US bandy), the top level bandy league in the United States
• Division Élite, a French baseball league
• First division (baseball), a baseball term
• FFHG Division 1, the second tier of French men's ice hockey
• Cyprus Basketball Division 1
• Hockeyettan, formerly Division 1, the third tier of ice hockey in Sweden, previously the first tier from 1944 to 1975
• LFH Division 1, the top tier of French women's team handball
• LNH Division 1, the top tier of French men's team handball
• NCAA Division I, the highest level of intercollegiate athletics in the U.S.
• Women's Flat Track Derby Association Division 1, the highest level of competition in women's flat track roller derby

• Football League One
• Primera división (disambiguation)
• 1st Division (disambiguation)
• A Division (disambiguation)
• Division II (disambiguation)
• Division (disambiguation)
• One (disambiguation)