Sōichi Nakaoka is a Japanese entertainer whose primary career is as a comedian, but he has also taken on occasional roles as a voice actor in animated films. He was born on December 8, 1977. He is a member of the comedy duo Rocchi, with whom he performs regularly, and is affiliated with the talent agency Watanabe Entertainment. His career in entertainment began in 1996, and after a brief hiatus, he returned to the industry in 2005.

Nakaoka's voice acting work, while not extensive, includes roles in prominent anime films. In the 2017 film Night is Short, Walk On Girl, directed by Masaaki Yuasa, he provided the voice for the character Kousaka. He also voiced the character Cancer in the 2019 feature Doraemon: Nobita's Chronicle of the Moon Exploration. These credits show his involvement in anime as a secondary facet of his career, which is predominantly focused on live-action television and comedy.

Information about recurring collaborations with specific anime directors or other voice actors is not readily available. His known work in the medium is limited to the two films mentioned, and his professional profile is defined by his extensive work as a television personality and comedian rather than by a body of voice acting achievements. His contributions to anime are therefore best understood as notable, but occasional, extensions of his broader career in Japanese entertainment.