Oono Marina, born April 5, 1972, is a Japanese voice actress and voice director from Hiroshima Prefecture. Her real name is Katayama Hiromi (片山 裕美). She is currently affiliated with Honey Rush, but also used to be affiliated with Aoni Production, TAB Production and Atelier Peach.

On April 8, 2018, Marina announced on her Twitter account that she will retire on December 31, 2019. On that day, she quit working for Atelier Peach as both a voice actress and voice director, deleted her Twitter acount, and retired from her singing activities as well. However, on the next day (January 1, 2020) she became affiliated with Honey Rush and continued her activities as both a voice actress and voice director, and created a new Twitter account as well.