Yūichi Iguchi is a Japanese voice actor from Tokyo, born on February 22, 1981. He is affiliated with the Tokyo Actor's Consumer's Cooperative Society (Haikyo). Iguchi graduated from the Haikyo Voice Actors Studio in 2005 and began his professional career in 2006.

He made his debut as a lead anime role in 2014, playing Kazunari Usa in the television series The Kawai Complex Guide to Manors and Hostel Behavior. His filmography includes a wide range of characters across various anime. He is known for roles such as Mitsuki Sarue, also known as Sariel, in The Devil Is a Part-Timer!!, Hayato Kongōji in Gaist Crusher, and Hikaru Akatsuki in Marvel Disk Wars: The Avengers. He also voices Max Alorse in the Fairy Tail series and has appeared in long-running franchises like Durarara!! and Jewelpet.

In the 2010s and 2020s, Iguchi continued to take on diverse roles, including Hotarumaru in Touken Ranbu: Hanamaru, Kibi in Beastars, and Kanata Minato in I★CHU: Halfway Through The Idol. His other notable anime credits include Sōta Serizawa in Lagrange: The Flower of Rin-ne, Makoto Ariga in Wandering Son, Kazuma Hiyama in Age 12, Doudou in The Familiar of Zero F, and Daishichi Hamakaze in Stella Women's Academy, High School Division Class C3. In the late 2010s, he was cast as Alexis Doucet in Record of Grancrest War, Kōta Mizuhara in Kono Oto Tomare!: Sounds of Life, You Keika in Spiritpact -Bond of the Underworld-, and Haruyoshi Shimomura in The case files of Jeweler Richard. He also voices Maura Aberald in the Shadowverse anime adaptation.

Beyond anime, Iguchi's work extends to video games, where he is credited under the alias Yūma Aoi for some adult-oriented titles. His prominent game roles include Heizou Shikanoin and Teppei in Genshin Impact, Hotarumaru in Touken Ranbu, and Britz Strudel in Fuga: Melodies of Steel. He has also performed narration work and appeared in tokusatsu productions, playing the Gatton Bugster in an episode of Kamen Rider Ex-Aid.

Iguchi holds several certifications, including a license for water supply equipment and drainage work, skills connected to his family's plumbing business.