Endocrinologists are medical doctors who specialize in the diagnosis and treatment of diseases of the endocrine glands, which regulate hormones.

Endocrinologists are internists who have additional training in endocrinology. They often treat diabetes and thyroid disorders. They may further specialize in treating specific age groups, such as pediatric endocrinologists, who only treat children.

Endocrinologists are certified, specializing in endocrinology and metabolism, by the Royal College of Physicians and Surgeons of Canada.