Mario Tomioka (冨岡真理央), nicknamed "Mario" (まりお), born December 6, 1986, in Tokyo, Japan, was the fifth actress to play Hotaru Tomoe/Sailor Saturn in the Sailor Moon musicals. Her first performance was in 2000, for the show Transylvania no Mori, and her last show was Last Dracul Saishuu Shou - Chou Wakusei Death Vulcan no Fuuin in 2001. After graduating, Mario returned as a guest for the 10th Anniversary Talk Show in 2002.
Mario was the second longest-running Sailor Saturn.
Since performing in the Myu, Mario has also performed in various other musical productions.