Mariko Kouda (國府田マリ子, Kōda Mariko, born September 5, 1969 in Miyashiro, Minami Saitama, Saitama Prefecture) is a Japanese actress, voice actress, J-pop singer and radio personality. She graduated from Kasukabe Kyōei High School and went on to major in Communications at Tamagawa University in Machida City, Tokyo, graduating in 1990. Kouda has had at least one song appear on the program Minna no Uta.

She was a member of the J-pop voice acting group, Drops, until they disbanded. They were most well known for singing the ending theme to the anime Doki Doki School Hours although they did perform a couple of concerts one of which was released on DVD.

She works for the talent management firm Aoni Production. Her most notable roles include Okinu from Ghost Sweeper Mikami, Miki Koishikawa from Marmalade Boy and Shaorin from Mamotte Shugogetten.