Obstetrics and gynecology is a broad and diverse branch of medicine, including surgery, management of the care of pregnant women, gynecologic care, oncology, and primary health care for women.

It is the medical specialty that encompasses the two subspecialties of obstetrics (covering pregnancy, childbirth, and the postpartum period) and gynaecology (covering the health of the female reproductive system – vagina, uterus, ovaries, and breasts). It is commonly abbreviated as OB-GYN or OB/GYN in US English, and as obs and gynae or O&G in British English.