Yō Ōizumi is a Japanese actor, television personality, and voice actor born on April 3, 1973, in Ebetsu, Hokkaido. He first gained popularity as a cast member on the Hokkaido-based variety series How do you like Wednesday? and is also a member of the theatrical unit TEAM-NACS. Since his entertainment debut in 1995, he has built a diverse career spanning television dramas, films, and voice acting for anime and video games.

In the realm of anime and animated films, Ōizumi has portrayed a wide range of characters. He is known for his role as the voice of Professor Hershel Layton, a character he originated in the 2007 puzzle video game Professor Layton and the Curious Village and later reprised for its sequels and the 2009 film Professor Layton and the Eternal Diva. His other prominent voice roles include the monkey beast Tatara in Mamoru Hosoda's The Boy and the Beast, Pepe Benengeli in the cycling anime film Nasu: Summer in Andalusia and its sequel Nasu: A Migratory Bird with Suitcase, and Ki-Kima in the fantasy film Brave Story. In television anime, he has voiced Kureo Mado in Tokyo Ghoul and, in a recurring capacity, the character Nezumi Otoko in multiple installments of the GeGeGe no Kitaro franchise, including the 2007 live-action film Kitaro and its 2008 sequel Kitaro and the Millennium Curse.

Beyond his work as a voice actor, Ōizumi frequently appears in live-action film and television productions. He has taken leading roles in films such as I am a Hero, where he played Hideo Suzuki, and After the Rain, portraying Masami Kondō. He also made a special appearance as Shou Tucker in the 2017 live-action adaptation of Fullmetal Alchemist. His performance in the 2015 film Kakekomi earned him the Best Actor award at the 58th Blue Ribbon Awards, and he has received multiple nominations for the Japan Academy Film Prize for his acting work.