Resident

Residency is a stage of post-graduate medical training. A resident physician is a doctor who has received a medical degree and practices medicine under the supervision of fully licensed physicians, usually in a hospital or clinic. A residency may follow the internship year or include the internship year as the first year of residency. Successful completion of residency training is a requirement to practice medicine as an attending physician. A resident may choose a residency in any specialty of their choosing but may have to complete years in more general training as prerequisites for some specialities.

Chief Resident
The Chief Resident, as described by Sydney Heron, is "the final year resident that rules over all residents". The Chief resident also handles training, call schedules and assignments of other residents on top of their own responsibilities to ensure that the department runs smoothly.

In the final episode of series three (Didn't We Almost Have It All?) Callie Torres is named the Chief Resident. In series four Miranda Bailey becomes Torres' 'number two' taking over many of her reposibilities; but once the Chief realises this he hands Bailey the role.

Residents

 * Dr. Meredith Grey (Fourth Year, Surgery)
 * Dr. Alex Karev (Fourth Year, Surgery)
 * Dr. Cristina Yang (Fourth Year, Surgery)
 * Dr. April Kepner (Fourth Year, Surgery)
 * Dr. Jackson Avery (Fourth Year, Surgery)
 * Dr. Lexie Grey (Third Year, Surgery)
 * Dr. Steve Mostow (Third Year, Surgery)
 * Dr .Graciella Guzman (Third Year, Surgery)
 * Dr. Ryan Spalding (Third Year, Surgery)

Former Residents

 * Dr. Izzie Stevens (Third Year, Surgery) - fired
 * Dr. George O'Malley (Second Year, Surgery) - deceased
 * Dr. Reed Adamsom (Third Year, Surgery) - deceased
 * Dr. Charles Percy (Third Year, Surgery) - deceased