St Columba College is a combined Anglican and Catholic College, opening in 1997, the first ecumenical educational venture of this kind in Australia. The College was an initiative of both the Anglican and Catholic Dioceses of Adelaide.

Intensive planning for the College began in 1995 and continued throughout 1996 with an Anglican and Catholic Schools Committee being established. This group had the important task of initial planning, and preparations for a 1997 opening. In support of the College's development the Hickinbotham Group generously donated the land for the Primary site.

In June 1996, the inaugural Principal, Ms Madeleine Brennan was appointed and an Interim Management Committee began to coordinate work at the 'local level'. 

Building work on the Primary site commenced on Monday 16 September 1996 enabling the planned opening of the College in January 1997. 207 students began their educational journey at St Columba College in that first year of operation. Extensive work then began on seeking approval for the College to become R-12. In October 1999 the College received notification from the Government regarding the success of its application to extend into secondary education. In the year 2000, the St Columba began its journey to becoming an R-12 College. 

Today the College has an enrolment of over 1400 students. It has outstanding facilities and provides students with the best possible learning outcomes. The success of St Columba College is a testament to the vision and commitment of those who worked so hard in establishing our College - a place of educational excellence.