Ad Santos is the professional pseudonym of Alicia Diana Santos Colmenero, a Mexican voice actress born on June 9, 1950. The name Ad Santos is derived from her initials, with Ad representing A.D. for Alicia Diana. She is active in the Latin American Spanish dubbing industry and has an extensive career voicing characters in animated series and films, particularly anime productions from the 1960s through the 1980s.

One of her notable voice roles is Pedro in the classic anime series Heidi - A Girl of the Alps, a credit she received under the name Ad Santos. In the same series, she is also credited as Diana Santos for the roles of Clara Sesseman and the narrator. Her other significant anime roles under the Diana Santos name include Hutch in The Adventures of Hutch the Honeybee, Jack in Jack and the Witch, Hols in Horus - Prince of the Sun, Elisa in Sekai Meisaku Dōwa: Hakuchō no Ōji, and Yam Yam in Hakushon Daimaō. She also voiced Pedro in the movie Puss n Boots. Her filmography extends to more contemporary productions, with a role as Sra. Kageyama in the Latin American dub of Mob Psycho 100 III. Beyond anime, she is widely recognized as the longstanding Latin Spanish voice of Minnie Mouse. Additional roles include Bo Peep in Lamp Life and Nai-Nai in Abominable.