Catherine McAuley High School , located in Portland, Maine was an all-girls' college preparatory school that was run by the Sisters of Mercy. It was located in the Roman Catholic Diocese of Portland. McAuley was the only remaining single-sex high school for young women in the state of Maine. The school was established by the Sisters of Mercy in 1969 and was named for their founder, the Catherine McAuley. Catherine McAuley High School was the successor school of two other all-women's Mercy schools, Saint Joseph's Academy (1881–1969) and Cathedral High School (1909–1969). In July 2016, the school building was transferred to The Maine Girls' Academy.