This is the Green Lantern diasambiguation page showing all versions of Green Lantern.
Hal Jordan: Hal Jordan was the original Green Lantern of the Lantern Corps.
John Stewart: John Stewart was the third Green Lantern who was chosen after Guy Gardner was in an accident and unable to be the secondary Lantern.
Guy Gardner: Guy Gardner was chosen to be the second Lantern of Earth as Hal Jordan's backup.
Simon Baz: Simon Baz was the fifth Green Lantern and was given the Green Lantern ring after Sinestro was killed in his second time as Green Lantern.
Alan Scott: The first Green Lantern who created the identity without knowing of the Lantern Corps.

Green Lantern (Kyle Rayner): Kyle Rayner is the fourth Green Lantern and became Green Lantern after Hal Jordan became Parallax and killed almost all of the Green Lanterns.

Green Lantern (Jessica Cruz): Jessica Cruz was the sixth Green Lantern and became a Green Lantern when she expelled the Power Ring from her showing incredible willpower