Mizuki Niizaki is a Japanese voice actress affiliated with the agency YU-RIN PRO. She was born on July 6 and is a native of Niigata Prefecture. Her career as a voice actress began in the early 2020s, and she became a member of YU-RIN PRO in October 2024. She has a range of skills that complement her performance work, including dance and proficiency in musical instruments such as the piano, flute, and trumpet.

Niizaki's early career included minor roles in television anime. In 2022, she voiced a guest character in the series SHINEPOST, and in 2023, she had an unnamed role in the anime Re-Main!. Her profile began to rise when she was cast in her first leading role as the female protagonist, Shizuku Kusano, in the television anime adaptation of the manga Futari Solo Camp, which is scheduled to premiere in July 2025. In this series, she stars opposite voice actor Daiki Hamano.

Beyond anime, Niizaki has also contributed her voice to other media. Her work includes roles in video games, such as providing the voice for the character Kyuryu in the game Azurea: Sora no Uta. She has also participated in drama segments for other games, such as a special broadcast for Path to Nowhere. Additionally, her portfolio includes voice work for television commercials and web commercials in Japan.