The 2012 Indonesia Super League U-21 season was the fourth edition of Indonesia Super League U-21 (ISL U-21), a companion competition Indonesian super league that are intended for footballers under the age of twenty-one years.
Persela U-21 is the defending champion in this season.
The competition is divided into three acts consist of two round the group and knockout round. The first round is divided into five groups each containing four and three clubs, two top teams of each group advanced to the second round. The second half consisted of two groups containing five teams in each group intended, the two best teams from each group advanced to the semifinals. The winner advanced to the final, while two teams who defeated third-ranked fight. Final winner becomes the champion.
Teams promoted to ISL U-21
Teams relegated
<small>Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players and Managers may hold more than one non-FIFA nationality.</small>
Round I of group stage started 2 April 2012 to ended on 25 April 2012 and round II started 9 May 2012 to ended on 24 May 2012.
Persijap Jepara U-21, Semen Padang U-21 (Previous Runner-up), Persiba Bantul U-21 and Persiraja U-21 withdrawn after the main team of the four U-21 team was withdrawn from Indonesia Super League and played in Indonesia Premier League.
All matches were played in Krakatau Steel Stadium, Cilegon (round I) and in Jakabaring Stadium, Palembang (round II).
All matches were played in Kanjuruhan Stadium, Malang Regency (round I) and in Gelora Delta Stadium, Sidoarjo (round II).
All matches were played in Persiba Stadium, Balikpapan (round I) and in Segiri Stadium, Samarinda (round II).
All matches were played in Teladan Stadium, Medan (round I) and in GOR Ciracas Stadium, Jakarta (round II).
All matches were played in Mandala Stadium, Jayapura
<small>Updated to games played on 24 May 2012.<br> Source: ISL U-21 ReviewISL U-21 Table<br> <sup>1</sup> = Persidafon U-21 walkover win over Persiwa U-21<br> <sup>2</sup> = Persipura U-21 walkover win over Persiwa U-21<br> <sup>3</sup> = Persiram U-21 walkover win over Persiwa U-21<br> <sup>4</sup> = Persiwa U-21 were deducted 9 points due to three times was not present at the stadium in the face of Persidafon U-21, Persipura U-21 and Persiram U-21<br> Rules for classification: 1st points; 2nd goal difference; 3rd number of goals scored.<br> (C) = Champion; (R) = Relegated; (P) = Promoted; (O) = Play-off winner; (A) = Advances to a further round.<br> Only applicable when the season is not finished:<br> (Q) = Qualified to the phase of tournament indicated; (TQ) = Qualified to tournament, but not yet to the particular phase indicated; (DQ) = Disqualified from tournament.</small>
This stage started after drawing in opening June 2012. Start on 16 June to end on 23 June 2012.
All matches were played in Surajaya Stadium, Lamongan.
All matches were played in Mandala Stadium, Jayapura.
<small>Updated to games played on 23 June 2012.<br> Source: ISL U-21 ReviewISL U-21 Table<br> Rules for classification: 1st points; 2nd goal difference; 3rd number of goals scored.<br> (C) = Champion; (R) = Relegated; (P) = Promoted; (O) = Play-off winner; (A) = Advances to a further round.<br> Only applicable when the season is not finished:<br> (Q) = Qualified to the phase of tournament indicated; (TQ) = Qualified to tournament, but not yet to the particular phase indicated; (DQ) = Disqualified from tournament.</small>
Including matches played on 1 July 2012