Theodosia is an English-language fantasy adventure television series, produced by ZDF and Cottonwood Media and based on the children's adventure novels by Robin LaFevers.

Presented at the 2021 MIPCOM, the first season premiered in the United States on HBO Max on 10 March 2022, followed by the premieres on CBBC on 25 April and Globoplay on 21 June 2022. It later premiered in Portugal on Biggs.

Theodosia was renewed for a second season, which adapted the second novel in LaFevers' series, of which the first half of thirteen episodes was released on BBC iPlayer on 21 January 2024. The remaining thirteen episodes were released on BBC iPlayer on 05 May 2024.

After Max dropped the rights on 17 May 2023, BYUtv picked up the US rights. While originally announced as only a season 1 pickup, this was debunked when BYUtv began televising the series. Season 1 began on the networks app and website on 22 October 2023, and season 2 premiered on the same on 23 October 2024.