Constance Helen Frost (23 June 1862 – 29 January 1920) was a New Zealand medical doctor, bacteriologist and pathologist.

[1] She later enrolled in the University of Otago Medical School, and graduated with MB, ChB in 1900, alongside Alice Woodward, Daisy Platts, and Jane Kinder.

[2] In 1903 Frost returned to New Zealand and set up her own practise as a doctor,[3] and became an honorary bacteriologist and pathologist at Auckland Hospital.

[1] Despite acknowledging Frost's skill as a bacteriologist, Auckland Hospital continued to advertise for a male replacement and renewed her temporary honorary position annually for fifteen years before finally upgrading it.

Despite this, support from Dr Florence Keller, who was the sole woman member of the Auckland Hospital and Charitable Aid Board, resulted in a small honorarium for Frost from 1913, in recognition of her increased workload, which would have impacted her income through private practice.