Yui Ishikawa is a Japanese actress and voice actress born on May 30, 1989, in Hyogo Prefecture, Japan. She is affiliated with the agency mitt management. Her path to voice acting began with training in the performing arts from a young age; at six years old, she joined the Himawari Theatre Group in Osaka, where she gained experience as a stage actress, performing in musicals and developing skills in classical ballet, jazz dance, and tap dance. She made her debut as an anime voice actress in 2007 with a role in the series Heroic Age.

Ishikawa's career is marked by several iconic and critically acclaimed performances. Her portrayal of Mikasa Ackerman in the globally popular Attack on Titan anime series, beginning in 2013, stands as one of her most significant and enduring roles. This performance brought her widespread recognition and contributed to her winning the Best Supporting Actress award at the 8th Seiyu Awards in 2014. Another landmark role came when she was cast as the titular character in Violet Evergarden, a performance that showcased her ability to convey deep emotion and earned her the Best Lead Actress award at the 15th Seiyu Awards in 2021. Her voice is also famously associated with the character YoRHa No. 2 Type B (2B) from the video game Nier: Automata and its anime adaptation, NieR:Automata Ver1.1a.

Throughout her career, Ishikawa has demonstrated considerable range, taking on a wide variety of roles across different genres. Her filmography includes action-oriented characters such as Enterprise in Azur Lane, Liskarm in Arknights: Prelude to Dawn, and Empress in Black Rock Shooter: Dawn Fall. She has also portrayed figures of historical and fantastical significance, like Jeanne Euphoria in How a Realist Hero Rebuilt the Kingdom and Elise Angel in Assassins Pride. In addition to these, her roles encompass comedic and slice-of-life characters, including Fuyutsuki-san in The Ice Guy and His Cool Female Colleague, Seiko Fuji in Police in a Pod, and Riri Minakami in Akebi's Sailor Uniform. She has also been a part of long-running and beloved franchises, voicing Hinaki Shinjō in the Aikatsu! series and Minori Ichinose / Cure Papaya in Tropical-Rouge! Pretty Cure. Her versatility extends to film as well, with a role in the critically acclaimed movie A Silent Voice.

Beyond her anime work, Ishikawa has been involved in various other projects. She has participated in music reading drama projects titled "UTA-KATA". She has also been a guest at anime conventions internationally, including Sakura-Con in Seattle and Japan Expo in Paris. In 2021, she announced her marriage.