Aki Tomosaki ( 友崎亜希, Tomozaki Aki) (born September 16, 1969) is a Japanese actress who made a name for herself in the "mature woman" genre of the adult video (AV) Industry, which has awarded her for her work in this field.

Tomosaki made her AV debut in 2000, at the age of 30, and she became a quite prolific actress.

In the first decade after the inception of the Japanese AV industry in the early 1980s, the vast majority of AV actresses had made their debuts in their late teens.

Notwithstanding beginning in the mid-1990s, a niche for "mature women" models in AVs began to appear.

Tomosaki's attractive motherly appearance and large breasts gave her a leading role opposite younger actors in a large number of AVs with an incest theme.

In December 2003, she appeared in the first videos released by the AV studio Madonna, now well known for their "mature woman" productions. She has been described as the veteran of over 250 adult videos, and a search in late 2010 at Amazon shows 181 DVDs listed for her. She has additionally performed in a number of "uncensored" videos, mostly sold in non-Japanese markets or underground in Japan, which don't have mosaic pixellation to obscure the genitals as is the case with standard Japanese porn. When asked how she has been able to shine in her field, Tomosaki replied: "I really think of something external that will get me excited. I really imagine something stimulating, like having sex with my boyfriend. It is the sole way you can do it because the viewer will know if it isn't real. There is so much competition that guys know what the real thing is."

On March 15, 2007, the Japanese adult film industry recognised Tomosaki's career by awarding her the Best Mature Actress Award at the 2007 Japanese satellite TV Adult Broadcasting Awards.