Ryōko Ono is a Japanese voice actress and stage actress born on June 22, 1977, in Yokohama, Kanagawa Prefecture. Before pursuing a career in voice acting, she worked as an office lady for six years. She made her debut as a voice actor in 2004 and was formerly affiliated with Mausu Promotion. After leaving that agency in March 2010, she worked as a freelancer before joining Power Rise in April 2016.

Ono is known for a versatile vocal range that makes her voice difficult to classify. She has also worked under several aliases, including Nazuna Gogyō and Rikka Kitami.

One of her most recognized roles is Mirajane Strauss in the long-running Fairy Tail franchise. She first voiced the character in the original 2009 series and reprised the role for multiple后续 seasons, including Fairy Tail (2014), Fairy Tail Final Series (2018), and the 2024 sequel Fairy Tail: 100 Years Quest. She also voiced the character in several OVA episodes and theatrical films, including Phoenix Priestess and Dragon Cry.

Other major anime roles include Wato in Black Jack (2004), Sasara Kusugawa in the ToHeart2 series, Atsuko in various installments of the Minami-ke franchise (Betsubara, Okawari, Okaeri), Kazuha Migiwa in Yosuga no Sora, and Airi Sena in Mashiroiro Symphony. She has also voiced Ayako Kawasaki in Sweet Blue Flowers, Hiyoko Tamaizumi in We Without Wings, Amy Stapleton in Immortal Grand Prix, Itsuki Habaragi and Otohime in Dragonaut - The Resonance, and the character of Spaceship in Nodame Cantabile. In the Zegapain series, she portrayed Ayaka Irie in Zegapain ADP and Irie in the original Zegapain. She voiced Satō-sensei in Yotsunoha and Gucchio in RGB Adventure. Her career also includes roles in The Wallflower, Smile Pretty Cure!, and ACCA: 13-Territory Inspection Dept..

Beyond animation, Ono has an extensive filmography in video games. She has contributed to titles such as the ToHeart2 series, BlazBlue: Central Fiction, Blue Dragon, the Fairy Tail games, and the Azur Lane mobile game. She has also worked extensively in foreign drama dubbing and has performed in stage productions.

Throughout her career, Ono has developed close friendships with fellow voice actors including Megumi樱井浩美, Mayumi吉田真弓, and Emi小暮英麻. She is also known to be a fan of the Yokohama DeNA BayStars baseball team.