Castlevania: Rondo of Blood (悪魔城ドラキュラX 血の輪廻 (ロンド), Akumajou Dracula X: Chi no Rondo, lit. Devil's Castle Dracula X: Rondo of Blood) is a platform video game developed by Konami for the PC Engine. It is set in the fiction universe of the Castlevania series, where the protagonist Richter Belmont goes to save his lover Annette, who was abducted by Dracula. Due to the enhanced capabilities of the PC Engine CD-ROM² with the Super System Card which greatly expanded the PC Engine's memory, anime cutscenes and voice acting were added to the game. It was released in Japan on October 29, 1993. A direct sequel to it, the critically acclaimed Castlevania: Symphony of the Night, was released in 1997.

The objective is to guide the primary player character Richter Belmont through nine stages, with four alternate routes, as he searches for his kidnapped beloved Annette and ultimately confronts Dracula in his castle. Richter makes use of a whip as his main weapon and one of six sub-weapons: an axe, a dagger, holy water, a grimoire, a pocket watch, and a cross. While exploring the castle, Richter can rescue four maidens, including Annette's young sister Maria Renard who then becomes a playable character. She attacks using her doves and one of six sub-weapons: a cat, dragon, cardinal, turtle, egg or musical notes. She is more agile, can do a double jump, and can do twice the amount of damage that Richter does in each normal attack because the doves she shoots out return to her and therefore can do a second hit of damage on the way back, but she takes much less damage than Richter before she dies.

Rondo of Blood incorporates elements from the earlier Castlevania games which typically featured linear gameplay and a member of the Belmont clan as the protagonist, and the later entries which emphasized untimed exploration of the environment.Rondo of Blood makes use of untimed stages with a clear beginning, but more than one ending to some levels; this then affects the subsequent environment, monsters, and boss monster that the player character encounters at the end of the level. Items such as money, hearts, and food can be found scattered throughout the areas.Rondo of Blood also features the Item Crash ability reused in subsequent Castlevania titles, which allows a sub-weapon to be used in a super attack. Its direct sequel, Castlevania: Symphony of the Night, reuses many of the monsters.