Marina Ōno, born Hiromi Katayama on April 5, 1972, in Hiroshima Prefecture, Japan, is a Japanese voice actress who has been active in the industry since 1995. Throughout her career, she has also performed under the stage names Hiromi Matsumoto, Hiromi Asō, and Chihiro Kanzaki.

Ōno has contributed to a range of anime series, video games, and drama CDs. Her notable anime roles include Komoe Harumachi in Eiken, Chiaki Nakahara in Dai-Guard, Elizabeth Aihara-Chang in Angel Links, Faury Carat in Tristia of the Deep Blue Sea, Shiho Kazami in Burst Angel, and Yuka Endo in You're Under Arrest and its subsequent film adaptation. In the OVA First Kiss Story, she voiced the character Ayaka Nanase.

Her extensive work in video games features several prominent roles. She is known for voicing Aki Nitta in Soul Link and its extensions, as well as Remit Marlena in Eternal Melody. Ōno also provided the voice for Uriko Nonomura in the Bloody Roar series, appearing in Bloody Roar 2, Bloody Roar 3, and Bloody Roar Primal Fury. Other game credits include Ayaka Nanase in First Kiss Story, Sachi in Pure Pure, and the character Honey in Saturn Bomberman Fight! Her career also includes the role of Mayuka Yoshizumi in the visual novel Family Affair.

Beyond voice acting, Ōno has worked as a singer, performing theme songs for various games, and has also taken on roles as a sound director and a teacher for aspiring voice actors, focusing on the specific techniques required for performance in bishoujo games.