Masakazu Nishida is a Japanese voice actor from Tokyo, born on November 1st. He is affiliated with the talent management cooperative Tokyo Actor's Consumer's Cooperative Society. Nishida is a graduate of the Amusement Media Academy. His voice is characterized as a baritone, and he has been active in the industry since the early 2000s.

Nishida is perhaps best known for two prominent and long-running roles in popular anime franchises. He voices the character Mezo Shoji (also known as Tentacole) in the long-running series My Hero Academia, a role he has played since 2016, appearing in multiple seasons of the television anime as well as in the films My Hero Academia: Two Heroes and My Hero Academia: Heroes Rising. He also provides the voice for the eccentric demon merchant Vanir in the KonoSuba franchise, including the television series KonoSuba: God's Blessing on This Wonderful World! 2 and KonoSuba: God's Blessing on This Wonderful World! 3, the film KONOSUBA - God's Blessing on This Wonderful World– Legend of Crimson, and the crossover comedy series Isekai Quartet and its second season.

Beyond these signature roles, Nishida has built an extensive career with a wide variety of character work. In the long-running fantasy series Log Horizon, he voices the character Eins across multiple seasons, including Log Horizon: Destruction of the Round Table. His other anime credits include Tyki Mikk in D.Gray-man Hallow, Cafeto in Drifters, and a role in the Japanese dub of the Marvel Future Avengers sequel as The Hood. He has also appeared in acclaimed series such as Silver Spoon, Haikyu!!, and Gintama.

His voice acting work extends significantly into the video game medium. Some of his notable game roles include Haurchefant in the hugely popular Final Fantasy XIV, Toto in the mobile game Dream Kingdom and 100 Princes, and roles in the Gunslinger Stratos series and the Dynamic Chord games. He has also voiced characters in adaptations of Chinese anime, such as Hai Yunfan in the Soul Buster series.

Throughout his career, Nishida has been a recurring presence in projects with specific casts and production teams. His work in the KonoSuba and Isekai Quartet franchises has led to frequent credits alongside voice actors such as Rie Takahashi, Sora Amamiya, and Jun Fukushima. He was also the co-host of a radio program with fellow voice actor Junichi Suwabe titled Suwabe Junichi Nishida Masakazu no Kakusei Chōshi (Junichi Suwabe and Masakazu Nishida's Awakening Tune). His ability to portray both serious, physically imposing characters like Mezo Shoji and comedic, eccentric figures like Vanir demonstrates his range and has solidified his reputation as a versatile and in-demand character actor in the anime industry.