Lost Girl is a Canadian supernatural drama television series that premiered on Showcase on September 12, 2010, and ran for five seasons. It follows the life of a bisexual succubus named Bo, played by Anna Silk, as she learns to control her superhuman abilities, help those in need, and discover the truth about her origins. The series was created by Michelle Lovretta and produced by Jay Firestone and Prodigy Pictures Inc., with the participation of the Canadian Television Fund (Canada Media Fund), and in association with Shaw Media.

Following good ratings and positive reviews, it was renewed for a second season on November 12, 2010 (two months after its premiere), with the episodes order afterwards increased to 22 episodes; a third season on December 9, 2011; a fourth season on February 28, 2013; and a fifth on February 27, 2014. On August 25, 2014, Showcase announced that the fifth season would be the last, with the original 13-episode order increased to 16 final episodes. The series' finale episode aired on October 25, 2015.

In Australia, Lost Girl premiered on Sci Fi Australia on July 14, 2011. In the United Kingdom and Ireland, it premiered on Syfy (UK) on September 1, 2011. In the United States, it premiered on Syfy on January 16, 2012.