Barbara O'Neill

Barbara O'Neill (b. 28 July 1953) is an Australian alternative health care promoter, known for advertising dangerous and unsupported health practices and ideas. She previously presented these treatments at alternative medicine organisations, wellness retreats, and Seventh-day Adventist Churches despite not having any recognised qualifications and failing nursing training. She is married to Michael O'Neill, the founder of the Informed Medical Options Party, an anti-vaccination and anti-fluoride political group.

In 2019, the Health Care Complaints Commission in New South Wales ruled that she is prohibited from providing any health-related services following several complaints from the public and health professionals. An investigation found that she provided dangerous advice to vulnerable patients, such as telling those with cancer to forego prescribed chemotherapy for bicarbonate of soda, and to give infants unpasteurised goat's milk. The investigation found that she also did not have any qualifications in a health-related field, and that she failed to meet the expected standards of unregistered health professionals.