Lady (Japanese: レディ, Hepburn: Redi), born Mary, is a character in Devil May Cry, an action-adventure game series created by Japanese developer and publisher Capcom. She was introduced in the 2005 title Devil May Cry 3: Dante's Awakening, as a demon hunter on a mission to avenge her mother's death at the hands of her father, Arkham. She is also present as a playable character in the sequel Devil May Cry 4: Special Edition (2015). Since her introduction, Lady has appeared in the series' various anime and manga releases, supporting the protagonist Dante, to whom she often provides support and employment.

The character was created by Bingo Morihashi alongside two other designers. She was specifically designed with several traits to distinguish her from other heroines in the franchise. While Lady does not play a major role in Devil May Cry 4 (2008), her design in that game was reworked to be more attractive, since the sequel takes place almost a decade after her introduction, when she was underage. Multiple actors have provided her voice in her numerous appearances, including Kari Wahlgren and Kate Higgins, while Fumiko Orikasa voices the character in Japanese versions of the games.

Critical reception to Lady has been positive. Various gaming publications have liked her role in the overall story of the franchise, and praised her debut as a playable character in Devil May Cry 4: Special Edition due to her unique movements. She has been listed as one of the best heroines in video gaming history, and her addition to the anime spin-off series has also been acclaimed.