The Student Representative Council (SRC) is the student voice within the school. It meets to discuss matters which students feel are important. It is run by students and provides an opportunity for them to voice the ideas and suggestions of the student body. Elections take place at the end of each year with the exception of Year 7, which is carried out early in Term One.

Macarthur Girls High School has a prefect body of Year 12 and Year 11 students who are elected by their peers and the staff. School prefect is an elected, leadership position. The Prefects make up the senior component of the SRC. Prefects are elected at the end of Year 10 and Year 11 and hold their position for a year.