Riona Imaizumi is a Japanese voice actress from Aichi Prefecture, born on January 26. She is affiliated with the agency ARTSVISION and is a graduate of the Japan Narration Acting Institute.

Imaizumi began her career in the 2010s, initially taking on minor roles in anime series. One of her earliest appearances was in the 2017 series LoveLive!Sunshine!!. She has since performed a variety of supporting roles in long-running shows such as Crayon Shin-chan, where she has voiced multiple characters, as well as in Detective Conan and Ninja Hattori-kun.

Her most notable role to date is Yamanin Zephyr (also known as Yamamin Zephyr) in the multimedia franchise Uma Musume Pretty Derby. She voices the character in the 2022 mobile game and has also portrayed the role in other franchise media. Notably, Imaizumi played Yamanin Zephyr in the stage play adaptation Uma Musume Pretty Derby: Sprinters' Story, marking her performance in a lead role for a stage production.

Beyond her work in Uma Musume Pretty Derby, Imaizumi has voiced characters such as Anna Clewn in Mashle: Magic and Muscles, Nagase Rion in Extreme Hearts, and Aoi in Disgaea 7. Her film work includes a role in the 2022 film Crayon Shin-chan: Mononoke Ninja Chinpuden. In video games, she has contributed to titles including Kemono Friends 3 and Brown Dust. Imaizumi has also participated in audio dramas and audiobook narrations.