Hiroki Shimowada is a Japanese voice actor, stage actor, and musician born on April 8, 1976, in Mie Prefecture. He began his career in the 1990s, initially working as a stage actor before transitioning to voice acting after graduating from the Japan Narration Acting Institute. Throughout his career, he has been affiliated with several talent agencies, including ARTSVISION, 81 Produce, and Office PAC, and is currently represented by Kekke Corporation. In 2010, he changed the spelling of his stage name from his birth name, Hiroki Shimowada (下和田裕貴), to Hiroki Shimowada (下和田ヒロキ).

Shimowada is known for his versatile vocal range, often playing characters that are young, high-pitched, or innocent, but also capable of portraying villains and more mature roles. He has built an extensive filmography across anime, video games, and foreign language dubbing since his debut.

One of his earlier prominent roles was as Toboe, the young and gentle wolf in the 2003 anime series Wolf's Rain. He has had recurring roles in long-running franchises, including multiple characters in the Doraemon anime series and films. In the 2020 film Doraemon: Nobita's New Dinosaur, he provided the voice for the character Top. He also voiced a character in the 2006 Doraemon film, Nobita's Dinosaur 2006.

Shimowada has been the voice of Shiro in the Dochamon Junior series. He has a significant association with the Hiiro no Kakera franchise, voicing the character Shinji Inukai across multiple television anime seasons and video game adaptations. He also voiced Rui Ayase in the NHK anime series The Telepathy Girl Ran and Hakase in Wan Wan Serebu Soreyuke! Tetsunoshin. In the 2012 film Eiga Jewelpet Sweets Dance Princess, he played the antagonist Duke Creme de Brûlée. Another notable anime role is Masatoshi Fukazawa in the 2005 series Gunparade Orchestra.

In the 2010s, he took on roles in several popular series. He voiced Toshikazu Hazamada in JoJo's Bizarre Adventure: Diamond Is Unbreakable and Tivey Pearlbaton in Re:Zero − Starting Life in Another World. He also had roles in series like Bakuman。 as Shoyo Takahama, Sengoku Basara as Ranmaru Mori, and Gintama as the God of Poverty.

Beyond anime, Shimowada has an extensive body of work in video games, notably in the Hiiro no Kakera series, the Summon Night series, and Zone of the Enders. He is also active in dubbing foreign films and television series and has made guest appearances in tokusatsu productions like Tokumei Sentai Go-Busters and Uchu Sentai Kyuranger.

In addition to his voice work, Shimowada is a skilled musician. He founded his own independent record label, Hikagaku Records, in 2009 and has composed and provided music for various media, including television programs and games. He has also collaborated with fellow voice actors on musical and performance projects, such as forming a duo with Yoshihisa Kawahara in 2007. Shimowada is also active as a lecturer at vocational schools, helping to train the next generation of voice actors.