Sadao Hasegawa (b. 1945 - d. 1999) was a prominent Japanese graphic artist specializing in male erotica. Hasegawa's work, notable for superb technical skills, elaborate and fantastic settings, and incorporating Japanese, Indian, South-East Asian, and African mythology, often turns to extreme sexual situations, bondage, and S&M themes, which, in the context of his stylized fantasy world, attain a nearly sacral intensity.

Sadao Hasegawa was a prominent homoerotic artist, surviving in Bancock until 1999. Sadao was a universalist who used what suited him to present his unique vision of male sexuality. His erotica is Japanese in origin yet incorporates figures and symbolism derived from Indian or Thai mythology, detailed psychotropic invention and the kind of angular motifs common in much illustration and design of the 1980's.