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The Ontario Anesthesiologists' Society (OAS) is the provincial specialty society for anesthesiology in Ontario. 

Anesthesiologists are the medical doctors who are responsible for your well-being before, during, and after surgery. We See You Through Your Most Critical Times

Ontario’s 1200 anesthesiologists:

Provide local, regional and general anesthesia in the Operating Room
Administer epidural analgesia to mothers in labour,
Assist with resuscitation in the Emergency Department, and
Treat critically ill patients in the Intensive Care Unit.

We provide sedation for painful procedures throughout the hospital. We treat both acute and chronic pain conditions, and are responsible for pre-operative assessment and the immediate post-operative care of patients undergoing surgery. We are often involved in running operating rooms, and are involved in hospital administration.