Kotomi Yamakawa is a Japanese voice actress born on March 12, 1982, in Hokkaido, Japan. She is affiliated with the Tokyo Actor's Consumer's Cooperative Society, having joined the agency in April 2009 after being previously associated with Ken Production and Genki Project, and a period as a freelancer. Her voice is classified as mezzo-soprano.

Yamakawa made her debut as a voice actress in 2001 with a role in the television anime series Fruits Basket. Since then, she has built a career with numerous roles across anime television series, original video animations, and video games.

She is known for several recurring roles in major franchises. She voiced Ako Izumi across multiple installments of the Mahō Sensei Negima! franchise, including the television series, OVAs such as Mahō Sensei Negima!: Shiroki Tsubasa Ala Alba and Mahō Sensei Negima!: Mō Hitotsu no Sekai, and the 2011 film Gekijōban Mahō Sensei Negima! Anime Final. In the Zero no Tsukaima series, she provided the voice for Cattleya, appearing in Zero no Tsukaima: Futatsuki no Kishi, Zero no Tsukaima: Princesses no Rondo, and the video game Zero no Tsukaima: Maigo no Shūmatsu to Ikusen no Symphony. Yamakawa is also prominently associated with the ToHeart2 game and anime franchise, where she voices the character Harumi Kouno in various OVAs including ToHeart2 adplus, ToHeart2 adnext, and several game titles.

Beyond these prominent roles, her extensive list of anime credits includes parts in Kämpfer (as Ryōka Yamakawa), High School D×D (as Yubelluna), SHIROBAKO (as Misato Segawa), and My Love Story!! (as Kurage Isobe). Her work also extends to video game franchises such as Suikoden IV and Suikoden V. In addition to Japanese animation, she has contributed to dubbing for Western productions, providing the Japanese voice for Batgirl in The Batman and Young Justice.

Yamakawa has also been active in radio and music. She formed a voice actor unit called dechikotto with fellow voice actress Konomi Iwamura, and together they hosted a radio program. She also performed as a vocalist in a live band named Passion!, which included other voice actors. Her contributions to character songs are numerous, with releases for series such as ToHeart2 and Zero no Tsukaima.