Hiroaki Tajiri is a Japanese voice actor affiliated with the talent agency 81 Produce. He was born on August 17, 1985, in Kumamoto Prefecture, Japan. His hobbies include building plastic models and playing water polo.

Tajiri began his career as a voice actor in 2010, taking on minor roles in anime series such as MM Ichi-Zoku and The World God Only Knows. In his debut year, he also provided a voice for the animated film Metal Fight Beyblade VS Taiyō Shakunetsu no Shinryakusha, playing the minor role of Atlantis Soldier Number 3.

In the years that followed, Tajiri built a portfolio of supporting characters across a wide range of anime television series. A recurring pattern in his early career was voicing ensemble and background characters, including numerous roles in long-running franchises like Pokémon: Best Wishes! and its sequels, as well as JoJo's Bizarre Adventure. He also voiced the character Master Griz in the 2012 anime series Baku Tech! Bakugan Gachi.

A significant role during this period was as Kentaro Maezono in the baseball anime Diamond no Ace, a character he began voicing in 2013 and continued to portray in subsequent seasons and original video animations. He also appeared in the anime adaptation of the video game Kingdom, voicing multiple characters across its first two seasons.

Tajiri became associated with the sports anime Yowamushi Pedal, starting with minor roles in the 2013 television series. He was later credited with the role of Yoshiaki Taura in the second television season, Yowamushi Pedal Grande Road, and in the 2015 theatrical film Gekijōban Yowamushi Pedal. His work in the franchise also included voicing other background characters such as referees and spectators.

Beyond anime, Tajiri has been active in voice dubbing for foreign films and television series. His dubbing credits include providing the Japanese voice for Luke Cage in the animated series Ultimate Spider-Man and for characters in Thomas & Friends. He has also contributed voices to live-action dubbing for films such as Ant-Man and The Wasp. In the video game industry, Tajiri has voiced characters in major titles including Final Fantasy VII Remake, Genso Suikoden: Tsumugareshi Hyakunen no Toki, and Tactics Ogre: Reborn.