Yasuhiro Mamiya is a Japanese voice actor born on December 7, 1981, in Chiba Prefecture, Japan. He is affiliated with the talent agency Kenyu Office. His path to becoming a voice actor was unconventional, as he initially enrolled in a vocational school's voice acting department primarily to avoid pursuing a university education. After graduating, he spent time as a recluse before recommitting to training and eventually securing work through auditions, joining Kenyu Office after attending its affiliated training school.

Since his debut, Mamiya has become known for his tenor voice, which often leads him to be cast in middle-aged and elderly roles. He possesses a versatile vocal range and a noted talent for imitating the voices of fellow senior voice actors, which he also utilizes to portray younger and comedic characters.

His career encompasses a wide array of roles in anime, video games, and dubbed versions of foreign media. In anime, some of his most prominent roles include Magma in the Dr. Stone franchise, GigantoMachia and Iwao Oguro (Knuckleduster) in the My Hero Academia series, and Mask De Masculine in Bleach: Thousand-Year Blood War. His filmography also includes Daisuke Honda in Night Head 2041, Enbi Takane in Shinobi no Ittoki, Kōji Nagata in Back Street Girls: Gokudols, Oz Mea in Fairy gone, Baran Sujita in Back Arrow, Iron Michael in Baki Hanma, Mr. Murohashi in Wasimo, Adeku in Pokémon Evolutions, Discoh in Mazica Party, and Dolph Wakaba in Monster Strike the Animation. He has also had roles in films such as Doraemon the Movie: Nobita's New Dinosaur and provided voices for characters like Bascillus in Birdy the Mighty: Decode and Spectra in Bakugan Battle Brawlers: New Vestroia.

Mamiya is also highly active in video game voice acting, with a particularly extensive list of credits. Notable game roles include Hugo Kupka (the Dominant of Titan) in Final Fantasy XVI, Ifrit in Final Fantasy XV, Gibraltar in Apex Legends, Pierro in Genshin Impact, and Russell Adler in Call of Duty: Black Ops 6. He has also voiced characters in the Japanese dubs of major Western games, such as Iron Mike in Days Gone and various roles in the Assassin's Creed series. His recent and upcoming projects include roles in the anime Sakamoto Days, Solo Leveling, and the game Fatal Fury: City of the Wolves.