Castlevania: Nocturne is an American adult animated dark fantasy action television series created and written by Clive Bradley for Netflix. A sequel to the Castlevania animated series (2017–2021), it is based on the video game series of the same name by Konami and adapted from the game Castlevania: Rondo of Blood (1993).

Announced in May 2021, a new series with a different cast of characters set in the Castlevania universe was confirmed that would focus on Richter Belmont, a descendant of previous protagonists Trevor and Sypha, and be set during the French Revolution. During Netflix's 2022 Geeked Week virtual event, the series' official title was revealed.

Castlevania: Nocturne premiered on Netflix on September 28, 2023. In October 2023, the series was renewed for a second season that premiered on January 16, 2025. The series received critical acclaim, with praise for its animation, directing, writing, themes, and voice cast, while its initial pacing and character development drew some criticism.