Yui Ishikawa (石川由依, Ishikawa Yui, born May 30, 1989) is a Japanese actress and singer who was previously represented by Sunaoka Office but now works for mitt management. Prior to becoming a voice actress, she worked mainly on stage. Her specialities are classical ballet, jazz dance, and tap dance. Before she started as a voice actress, she was a stage actress and has been voicing radio dramas since 2007.

Her biggest roles were as starring characters Mikasa Ackerman in Attack on Titan and Violet Evergarden in Violet Evergarden. She also voices China Kousaka in Gundam Build Fighters, Sayuri Haruno in Bonjour Sweet Love Patisserie, Hinaki Shinjo in Aikatsu, and YoRHa No.2 Type B (2B) in Nier: Automata. At the 8th Seiyu Awards in 2014, she won an award for Best Supporting Actress. She also won the award for Best Actress in a Leading Role at the 15th Annual Seiyū Awards in 2021 for her role in Violet Evergarden.

She has attended anime conventions around the world, including Sakura-Con in Seattle, Otakuthon in Montreal, Japan Expo in Paris, and Madman Anime Festival in Brisbane.