A registrar is a doctor in the middle of their training, after being a junior doctor and before being a consultant. They are leaders in their own right and work as deputies to the consultants. The role of a registrar is very variable and includes hospital inpatient work, outpatient work in a clinic, procedure area or operating theatre. They are responsible for the medical care of patients in a hospital, including the diagnosis and treatment of patients, as well as the coordination of care between different medical specialties. There are different names for this registrar period, including senior registrar (‘SR’), specialist registrar (‘SpR’) and now specialist trainee (‘ST’) . In the UK and the Republic of Ireland, a specialist registrar (SpR) is a doctor who is receiving advanced training in a specialist field of medicine in order to become a consultant in that specialty. In Australia, registrars are required to complete a minimum of three years of training in order to be eligible for Fellowship of the Royal Australasian College of Physicians or the Australian College of Rural and Remote Medicine.

In summary, a registrar is a doctor in the middle of their training, responsible for the medical care of patients in a hospital, and working as deputies to the consultants. They are leaders in their own right and have different names depending on the country and specialty.