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This is a list of characters in the original sequel Oz books by American author L. Frank Baum, and in the later continued Oz series by his grandson Roger S. Baum, Ruth Plumly Thompson, John R. Neill, Jack Snow, Rachel Cosgrove Payes, Eloise Jarvis McGraw and Lauren McGraw, Dick Martin, Eric Shanower, and Sherwood Smith. Characters from Gregory Maguire's Wicked are not included, as his works, among others such as the work of March Laumer, are considered "heretical" in Baum scholarship (The term "heretical" was first applied to these books by Dr. Stephen J. Teller of Pittsburg State University in the Winter 1988 issue of The Baum Bugle and appears regularly in Oz fandom).

The A-B-Sea Serpent is a 200-foot-long snake made up of a series of alphabet blocks that appeared in The Royal Book of Oz. He lives in Mer City where he teaches the merchildren their letters

Abatha the Good Witch of the East is the title character in Eric Shanower's graphic novel, The Blue Witch of Oz. She fell under a spell during a custody battle with her brother-in-law over custody of her son.

Agnes is a dragon who appeared in The Giant Horse of Oz. She is the close friend and assistant of the Good Witch of the North.

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