Mater Dei Catholic College is a Roman Catholic co-educational secondary day school catering for students in Year 7 to Year 12, located in the Wagga Wagga suburb of Lake Albert, in New South Wales, Australia.

Then, in years 11 and 12, both schools merged to Trinity Senior High School, located at the current site of Kildare Catholic College, Wagga.

It has five houses which are each named after significant people in the college's history.

Kennedy (Blue), after Graham Kennedy, Rosarie (Red), after Sister Rosarie, Webber (Green), after Sister Webber, Caroll (Purple) House after Bishop Carroll and Sherrin (Gold) after Brother Carl Sherrin, principal of Trinity Senior High from 1988 to 1993.

This article related to an Australian school is a stub.