Hideto Aki is a Japanese adult video (AV) director who has directed more than 300 movies since 1998.

Hideto Aki was born in Shizuoka Prefecture, Japan in 1970. He tells how AV Idol Hitomi Kobayashi came to his neighborhood video rental shop when he was 17 and he shook hands with her and more than 10 years later he still remembered how small and cute her hand was. He said about the event (in his 1999 "Diary"): "At the time I didn't even imagine that I would do this kind of work. Now, I can't imagine doing anything else."

Although he says he always enjoyed pink films, especially the "Four Devils" (or "Four Heavenly Kings of Pink"), he is doubtful about trying to use dramatic stories in AV. He prefers to work in the documentary style much used in Japanese porn, feeling that fiction and sex don't mix well ("If so, it is better [to] watch pink cinema"). He says he has to do it sometimes when the production side wants it or if they are using a famous actress but he describes dramatic AV as "director's masturbation".

Aki received his early training in the AV industry from Hot Entertainment and that company's founder Shungo Kaji. By late 1998, Aki was working for the Kuki studio and in a series of "Behind-the-scenes Diaries" from March to December 1999, he described his techniques and methods of working with actresses while making videos for Kuki. He also directed for the adult channel Cherry Bomb on the Japanese satellite TV network SKY Perfect. Aki continued with Kuki through 2002 when he began directing regularly for KMP. By the end of 2004 he began working with S1 No. 1 Style and since that time he has directed more than 200 videos for S1, although he has continued to work for KMP and also occasionally for Moodyz and other studios.

As part of the celebration of Shelly Fujii's three-year anniversary with KMP in November 2011, Aki directed one of the 4 sections of her video, Shelly Fujii 3rd Anniversary - 4 Performances With 4 Different Directors, along with K*WEST, Takuan & Company Matsuo.

At S1, he has directed the debut videos for that company of such AV superstars as Yua Aida, Sola Aoi, Rin Aoki, Yuma Asami, Honoka, Mihiro, Maria Ozawa, Akiho Yoshizawa and Tina Yuzuki (Rio).