Newington College is regarded as MLC School's ‘brother school’. The two schools shared the same Principal, the Reverend Charles Prescott. Reverend Prescott founded MLC School and was Principal from 1886 to 1889 and then served as Headmaster at Newington College from 1900 to 1931.

Both schools share the values of the Uniting Church. The two schools have many families in common with their daughters at MLC School and their sons at Newington College.

MLC School and Newington College collaborate in many different areas of school life – White Ribbon Day, International Women's Day, musical concerts, and school drama productions.

In July 2019, we were excited to announce a proposed joint cadet program between Newington College and MLC School. This program is now well underway and provides girls with exciting and challenging opportunities to move outside of their comfort zone, work effectively in teams and develop individual character and leadership skills.

The cadet training program is exciting and varied, encompassing a range of activities such as scuba diving, rock climbing, abseiling, archery, bush navigation and camp craft. There are also leadership courses offered which are progressive in nature and teach the girls valuable life skills. The successful completion of these courses results in promotion to a higher rank. There is also an annual camp and a promotions camp.