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The 2021 Uruguayan Segunda División was the season of second division professional of football in Uruguay. A total of 12 teams competed; the top two teams and the winner of the Championship play-offs were promoted to the Uruguayan Primera División. On 19 March 2021, Nicolás Siri became the youngest hat-trick scorer in the history of Uruguayan football and the second in South America behind Pelé, after scoring a hat-trick in Danubio's 5–1 win against Boston River, at the age of 16 years and 11 months.
Updated to match(es) played on 10 November 2021. Source: Soccerway Rules for classification: 1st points; 2nd goal difference; 3rd goals scored; 4th head-to-head points; 5th head-to-head goal difference; 6th head-to-head goals scored. This does not apply to determining the champion. If two or more teams had been tied in point at the end of the tournament, a playoff would have been held at a neutral venue within 72 hours for the championship (C) Champions; (P) Promoted