Kouji Tsujimoto, also known by the romanization Koji Tsujimoto, is a Japanese actor, voice actor, and comedian born on January 14, 1977, in Wakayama Prefecture, Japan. He is affiliated with the talent agency FMG. Tsujimoto began his entertainment career as a comedic performer, and in 2002, he co-founded the comedy trio Flamingo. While maintaining his roots in comedy, he has expanded his career to include substantial work in both live-action television and voice acting for animation.

As a voice actor, Tsujimoto is known for the role of Sōgen Mongorian in the anime series Doamayger-D. He also voiced the character Kanta in the series Mushishi: The Next Chapter. Beyond these animated roles, he has an extensive list of credits in live-action Japanese television dramas and films, often appearing in supporting or guest roles. His television drama appearances include roles in Room Of King, SPEC: Sho, the long-running police drama警視庁・搜查一課長 season five (Metropolitan Police Department Investigation Section 1 Chief), and 野武士の美食 (Nobushi no Gourmet). His film credits include 苦役列車 (The Love and The Train) and the SPEC film series, among many others.