Yuuko Satou is a Japanese voice actress born on December 25 in Kanagawa Prefecture, Japan. Her birth name is Sumiko Toma. She is affiliated with the talent agency Aksent.

Satou's career in voice acting began in the 1990s. Her debut in TV anime included small roles in series such as Elf Hunter and Midori no Makibao. A pivotal moment in her career came when she was cast as the lead character Yoh Asakura in the 2001 anime adaptation of Shaman King. Her natural and relaxed delivery during the audition distinguished her from other candidates and secured her the role. This performance is considered one of her most iconic and helped establish her in the industry.

Her filmography includes a wide variety of characters across numerous anime series. She voiced the homunculus Lust in the 2003 Fullmetal Alchemist series, a role she reprised in related OVA releases such as Fullmetal Alchemist: Chibi Party and Fullmetal Alchemist: Premium Collection. She also played Issa in Animal Yokocho and Hakan Akbal in the ONA series Flag, as mentioned in provided examples. Her other notable anime roles include Sharaku in Black Jack, Takumi Kisaragi in Gad Guard, Juri Wu Nien in Mobile Suit Gundam SEED, and Oryou in Gintama. She has also contributed to popular long-running franchises, with guest roles in series such as Detective Conan, Nintama Rantaro, Naruto, and Pokémon.

Beyond anime, Satou's work extends to video games, including appearances in the Super Robot Wars series and various games based on Shaman King and Gundam. She has also been involved in dubbing foreign films and television series into Japanese and has participated in stage readings and narration work. Her voice is described as having a distinctive husky quality, placing it in the alto range.