The 30 competing schools were all assigned with an NBA team during the draft, and then presented with the appropriate team’s kit at the event at St Peter’s RC High School.
Each school will play eight games, followed by single-elimination play-offs and a league championship.
The programme is for boys and girls aged 11-12.
Giants Business Manager, James Gordon, attended the event and said: “To have the biggest league in the world aligned with a specific basketball programme in Manchester is a great positive for the development of the game here.
“We look forward to attending games throughout the season, and hopefully seeing some stars of the future.
“Although reaching the NBA is of course unlikely, there is a pathway in Manchester to playing professional basketball in the UK, and we as a club have been particularly keen to promote British talent since returning to the BBL five years ago.
“Hopefully some of the children inspired to take part by the NBA’s involvement will go on to play for their local league teams – perhaps even the Giants’ junior teams.
“We look forward to welcoming players and their parents to Giants games throughout the season.”
NBA EMEA Senior Director, Basketball Operations Neal Meyer, said: “The Jr. NBA is our key grassroots level programme and we are pleased to work in partnership with Basketball England to inspire more children in England to participate in basketball through a fun and competitive experience.”
Basketball England Education & Satellite Club Manager Charlie Ford commented: “The Jr. NBA Basketball England League provides young people with a great first experience in the game which we hope will provide the catalyst to continuing to participate and enjoy basketball throughout their lives.”