Trinity Grammar School may refer to:
In Australia:
- Trinity Grammar School (Victoria) located in the Melbourne suburb of Kew, Victoria
- Trinity Grammar School (New South Wales) located in the Sydney suburb of Summer Hill, New South Wales
- Trinity Grammar School Preparatory School located in the Sydney suburb of Strathfield, New South Wales
In the United Kingdom:
- Woodside High School, Wood Green, formerly known as Trinity Grammar School
See also
- Trinity School (disambiguation)