Kōichi Saitō (斉藤 幸一, Saitō Kōichi) is a Japanese cinematographer. At the beginning of his career, he often worked with "Four Heavenly Kings of Pink" (ピンク四天王, pinku shitenno) pink film directors Takahisa Zeze and Hisayasu Satō. Saitō also worked with all nearly every director of the post-Heavenly King generation at Kokuei studio. Now working mostly in mainstream film, he still often teams up with Zeze.