Constance Elizabeth Harker (1 April 1875 – 16 December 1964) was an Australian headmistress who with Marjorie Jarrett ran the Brisbane High School for Girls.

Under their leadership it became part of the Presbyterian and Methodist Schools Association and gained its popular name of Somerville House.

[2] She studied history and English and graduated in 1895 with a first class honours degree,[1] It was at Presbyterian Ladies' College, Croydon that she met her future partner Marjorie Kate Jarrett where they were both teaching.

She returned in 1908 and began work at the Brisbane High School for Girls as the acting headmistress.

[1] In 1920 the school moved into Cumbooquepa the former home of the politician and newspaperman Thomas Blacket Stephens in Vulture Street, South Brisbane.