The Grey Foundation, established by the Old Greys’ Union, aims to assist the Schools with the critical function of fundraising as well as to provide financial assistance via a substantial investment portfolio. The Foundation's Board of Trustees has representatives from the Junior school, the High school, Old Greys' Union and independant prominent Old Greys which ensures that all key interests are represented.

The office of The Grey Foundation is located ‘neath the clock tower on the Grey High campus.