[2] Persipura U19s were the defending champions after defeating Persib U19s 1–0 in last year final.
[3] Persib U19s won the title on 26 November 2018 after defeating Persija U19s 1–0 in the final.
[2] Player registration regulations were as follows:[5] First round was the group stage and started on 29 September 2018.
All groups play double-game round-robin home tournament.
The winners and runner-ups from each group along with two best third-placed teams advance to second round.
Bali United U19s hosted the first half at Kapten I Wayan Dipta Stadium.