Ottawa South United is a Canadian semi-professional soccer team based in Manotick, Ontario, a community in the rural south part of Ottawa that plays in the Première Ligue de soccer du Québec. The club previously competed in League1 Ontario. In 2020, the club formed a partnership with Canadian Premier League club Atlético Ottawa and as part of the partnership, their PLSQ teams will be known as OSU Atlético. The team is part of the larger Ottawa South United youth soccer club organization.