Annabelle was the sister of Nels Oleson on Little House on the Prairie and appeared in the episode titled Annabelle. She was a member of the circus that travelled through Walnut Grove.
Annabelle was played by Harriet Gibson, sometimes referred to as Harriett Gibson. She did not appear on too many television shows either before or after her Little House on the Prairie appearance. And her portrayal as Annabelle was her best-known role, especially with the show still playing in reruns.