The 2015 Under-21 Provincial Championship Group B was contested from 15 August to 10 October 2015.
The tournament was won by the SWD U21s; they beat the Limpopo Blue Bulls U19s 32–29 in the final played on 8 October 2015.
The title winner qualify to the promotion play-off, playing away from home against the bottom team from Group A.
For each round, their cumulative points total is shown with the overall log position in brackets: The following matches were played in the 2015 Under-21 Provincial Championship Group B:[4]
The honour roll for the 2015 Under-21 Provincial Championship Group B was: The following table contain points which were scored in the 2015 Under-21 Provincial Championship Group B:[45] The teams released the following squad lists: The following table contains all the cards handed out during the tournament:[54] The following referees officiated matches in the 2015 Under-21 Provincial Championship Group B: