Margaret Hilda Harper (4 April 1879 – 2 January 1964) was an Australian pediatrician, medical writer, and radio commentator.

Through most of her life, she was raised by her aunts and housekeepers until her father had another child, Robert Rainy Harper, with his second wife, whom he married in 1892.

Harper was one of the recipients of the W. T. Mollison Scholarship, granted to matriculated students between the ages of seventeen and twenty one who are interested in studying foreign languages.

After Harper graduated, she began her career as a resident medical officer at the Royal Hospital for Women in Paddington, New South Wales.

[5] She was also a medical officer at the first baby clinic that was built in the Royal Alexandra Hospital for Children, located in Camperdown, New South Wales.

In 1949, she was appointed as a member of the Child Welfare Advisory Council of New South Wales, improving the healthcare and safety of the children.