Yūko Katō is a Japanese voice actor and narrator from Chiba Prefecture, born on August 2. She is affiliated with the narrator casting organization Inoshishi-chō and works as a freelancer. Her career path is distinctive, as she spent four years as a corporate employee before becoming a host and reporter for four years on the NHK Educational TV science programs for sixth graders, "Hate na Science" and "Shirabete Science". Following this on-screen role, she transitioned to voice acting, focusing primarily on voice work for foreign language dubs, animation, and narration. Over her career, she has used different stage names, including Yūko Katō written as 加藤ゆう子 and 加藤優子, before settling on her current name, 加藤有生子, in 2014.

Katō has built an extensive career in anime television, often voicing supporting characters. She is well known for her long-running role as Sumiko Kobayashi, the homeroom teacher of the Junior Detective League, in the long-running series Detective Conan, a role she has played since at least 2003. Another notable role is Kyōko Asahina, the mother of the main character in Witchy Pretty Cure! and its sequel. Her other anime credits span a wide range of series, including Hannah Bester in Eureka Seven AO, Yuko Shishigami in Inuyashiki, Satsuki in Nana, Hanabusa in Buso Renkin, and the young Temujin in the Naruto film Naruto the Movie 2: Legend of the Stone of Gelel. She also voiced the character Sunjidmaa in the 2000 OVA The Prince and the White Horse. In addition to these, she has had roles in Heartcatch Precure! as Mizuki Hanasaki and in Zoids: Fuzers as Sarah.

Beyond anime, a significant portion of Katō's work is in voice-over for foreign films and TV series. Her dubbing portfolio is extensive, and she has provided the Japanese voice for a wide array of actresses. Notable credits include playing the lead role of Lucy Preston in the series Timeless, appearing in the 007 film series as Miss Moneypenny, and voicing characters in major films such as Gone Girl (as Amy Dunne), Alien: Covenant, and Incredibles 2. She has also voiced the character April O'Neil in the Teenage Mutant Ninja Turtles animation and the mother in Hilda's Adventure.

Katō is also active as a narrator, providing narration for various television programs. Her narration work includes NHK E Tele's "Science Zero" and "100 Pun de Meicho," as well as promotional pieces for companies and events. She has also provided the audio guide for the Yayoi Kusama exhibition.