Yōko Imaizumi is a Japanese actress and voice actor born on August 2, 1966, in Tokyo. She has been active in the entertainment industry since the early 1980s, beginning her professional career in 1983. Imaizumi started her training by entering the theater school of the Tokyo Actor's Consumer's Cooperative Society, also known as Haikyo, an organization she remains affiliated with throughout her career.

Imaizumi is recognized for her versatile voice work across a wide range of anime series. She is frequently cast in roles depicting mothers, older women, and authoritative figures, often bringing a warm presence to her performances. One of her notable recent roles is Kaede Hanamiya, the grandmother of the protagonist Tsubasa, in the series Hokkaido Gals Are Super Adorable!. Her extensive anime filmography includes performances in long-running and popular series such as Gintama, Detective Conan, IDOLiSH7, Persona 5 The Animation, High School DxD HERO, and Yagate Kimi ni Naru. She also appeared in the 2024 series Train to the End of the World.

Beyond anime, Imaizumi has a robust career in dubbing foreign films and series, lending her voice to Japanese-language versions of international hits like Parasite, Midsommar, Jungle Cruise, RRR, and films within the Marvel Cinematic Universe. Her voice is also featured in video games, including Yakuza: Like a Dragon, Nobunaga's Ambition, and Mahoutsukai no Yoru. Complementing her voice work, she is also a trained stage actress and has performed in musicals such as a Toho production of Les Misérables and Blood Brothers.