Prior to 1985, GPS Basketball consisted of a one-day tournament that included Under-15 and Open divisions. The last of these days was held at and won by Ipswich Grammar School.

On this day a group of basketball coaches and teachers from the competing schools decided to approach the GPS Sportsmasters for permission to run a full GPS Basketball premiership in subsequent years. Permission was granted for a trial GPS Basketball season for 1985 on a home and away basis. The competition initially consisted of Under-13, Under-15 and Firsts divisions.

Ipswich Grammar School won the trial premiership with seven wins and no losses. Brisbane Grammar School was the only non-competing school. The first official GPS Basketball Premiership was held in 1986. Once again, Ipswich Grammar School were undefeated premiers. This early success was the launching pad for many successful seasons to follow, with IGS widely recognised as a powerhouse of GPS Basketball.

Ipswich Grammar has won eight premierships including 1985 (unofficial), 1986, 1991, 1992, 1993, 1994, 1996, 2015 and 2018. Our Firsts have rarely been out of the top three places.

NBL players
Ipswich Grammar's NBL representatives include Bruce Hamilton, Eric Van Ass, Brendan Beak, Nathan Niesler (Bullets NBL Champions 2007), Michal Shaw, Daniel George, Zach Carter and Matt Hodgson.

Master In Charge

Mr Jason Ralph