Grey's Anatomy is an American television medical drama series created by Shonda Rhimes and broadcast by ABC.
During its first season, the show featured nine lead characters.
Throughout subsequent seasons, many characters have been written out, either due to actors electing to depart the show or due to screenwriters altering character arcs.
The following is a list of characters by role type who have appeared over the various seasons since the drama's premiere.
The following listings reflect each character's status at the time of their first appearance on staff at Seattle Grace/Seattle Grace Mercy West/Grey Sloan Memorial.