Mariko Akashi is a Japanese voice actor born on May 18, 1950, in Tokyo, Japan. Her name in its original Japanese spelling is 赤司まり子.

Akashi is primarily known for her involvement in the Eureka Seven franchise, a renowned mecha anime series created by Studio Bones. Her most prominent and recurring role is that of a character named Coda. In the original 2005 Eureka Seven television series, she provided the voice for Coda Lovell. She reprised this role for the 2009 film, Eureka Seven: Good Night, Sleep Tight, Young Lovers, again voicing Coda Lovell. Her association with the series continued with the 2017 film, Eureka Seven: Hi-Evolution 1, where she voiced a related character named Niko Coda.

Beyond the Eureka Seven franchise, another notable credit in Akashi's career is a guest role in the anime series Michiko & Hatchin, where she voiced the character Liliana in the sixth episode. Publicly available information does not detail any recurring collaborations with specific directors or studios outside of her work on the various entries in the Eureka Seven series, nor does it list other major roles or formal accolades.