Mari Tomokawa is a Japanese voice actor from Fukuoka Prefecture, born on March 24, 1969. Some sources also list an alternative birth date of August 4, 1969. She is affiliated with the talent management firm Ken Production. Tomokawa is a graduate of the National University of Fine Arts and Music, where she earned teaching licenses for middle and high school music. She also studied abroad in San Francisco and is a graduate of the Amusement Media General Institute's voice actor and talent course.

Tomokawa's career has spanned various genres, including television animation, original video animations, and video games. One of her notable roles is Yunseryua in the television anime series Crest of the Stars. She has also had numerous guest roles in long-running series, providing voices for different characters in Detective Conan, such as a train passenger, a female investigator, and a forensics member across multiple episodes. Her other television anime credits include roles in Cowboy Bebop as a reporter and Devilman Lady as various newscasters and women.

In the original video animation format, Tomokawa has voiced significant characters. She played Yukiko Misuzu in the series Shion and Karen Konohara in the series Yakin Byōtō Ni. She also voiced a character named Yunfa in Triangle Heart: Sweet Songs Forever and appeared in the second Aoyama Gōshō Tanpen-shū as a clerk. Her work extends to video games, including the role of Sato Yuka in the game Roommate Novel ~Sato Yuka~.

Beyond anime and games, Tomokawa's professional background includes work in dubbing foreign films and providing narration for various television programs and commercials. Her skills include playing the piano and singing both classical and pop music.