Castlevania: Nocturne is an American adult animated dark fantasy action television series created and written by Clive Bradley and led by producer Kevin Kolde for Netflix. A sequel to the Castlevania animated series, it is based on the video game series of the same name by Konami and adapted from the 1993 entry Castlevania: Rondo of Blood and its 1997 sequel Castlevania: Symphony of the Night. Set in 1792, during the French Revolution, it follows Richter Belmont, a descendant of the Belmont family fighting against vampires and night creatures. The series stars Edward Bluemel, Thuso Mbedu, Pixie Davies, Richard Dormer, Sydney James Harcourt, Nastassja Kinski, Zahn McClarnon, Aaron Neil, Sophie Skelton, Elarica Johnson, Franka Potente and Iain Glen in the voice cast.

Announced in May 2021, a new series with a new cast of characters set in the Castlevania universe was being planned by Netflix, but that it would not be a direct spin-off of the original Castlevania series. Instead, it would focus on Richter Belmont, Trevor and Sypha's descendant, and Maria Renard, set during the French Revolution. During Netflix's 2022 Geeked Week virtual event, the series' official title was announced.

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