Trinity Grammar School is composed of four campuses, The Senior & Junior Schools at Summer Hill, The Preparatory School at Strathfield, The Infants' School at Lewisham and the outdoor campus at Pine Bluff. A strong pastoral and spiritual thread ties together the academic, sporting and cultural elements of the School.

Trinity Grammar School Preparatory School is a busy, happy place catering for boys from Years Pre-K to 6. Each boy can experience a secure learning environment and know that he has an important contribution to make.

The Trinity Grammar School Junior School was established in 2000 at the Summer Hill Campus, catering for boys from Years 3 to 6.

Trinity Infants' School commenced on 6th February, 2006, at Lewisham, on the site previously occupied by St. Thomas Beckett Primary School. The Lewisham campus caters for boys from Pre-Kindergarten to Year 2. Boys completing Year 2 at Lewisham will progress through the Junior School at Summer Hill.

The Middle School at Trinity Grammar School acknowledges the particular needs of boys aged twelve to fifteen and signals the School's commitment to providing appropriate level instruction and support, and appropriate programmes for all of the boys of the School.

Trinity Grammar Senior School commences in Year 10 and concludes after the boys complete their HSC or IB.

Trinity Grammar School 2007 Educational and Financial Report
to the Board of Studies