The following is a list of characters that appear in the Young Justice TV series and its comic book tie-ins.
Note for reading: The designations for the characters are used when the zeta beams beam them from one place to another, and are normally spoken in episode by an automated voice (recorded by Stephanie Lemelin). Numbers without a letter represent members of the Justice League, A rank represents individuals authorized to use the zeta beams, B rank represents members of the Team, C rank represents the Team's pets, D rank represents members of the Outsiders, E rank represents the reserve members of the Justice League, G rank represents the individuals added to a splinter Team assembled by Nightwing, Z rank represents members of Batman, Incorporated, and L represents Light members.