Mahana Yamasaki is a Japanese female voice actor affiliated with the agency Aoni Production. She was born in Chiba Prefecture, Japan, and her birthday is January 30. Yamasaki is a graduate of Komazawa University's Faculty of Global Media Studies.

Yamasaki's path to becoming a voice actor was inspired by the performance of voice actor Marina Inoue as Armin Arlert in the anime series Attack on Titan. She made her professional debut in 2023, voicing the small role of the pet owner's sister in the long-running anime series Chibi Maruko-chan.

Her career began to gain momentum in 2024. A significant early role was providing the narration for the ABEMA program SHIBUYA ANIME BASE starting in April of that year. In the summer of 2024, she landed her first regular role in a television series as the voice of Moco in the Sanrio collaboration anime JOCHUM. The series, which features short one-minute episodes, is based on characters created from a collaboration with the Japanese boy band JO1, with Moco representing band member Shohei Ohira. Yamasaki continued in this role for the show's second season, which premiered in October 2025.

Later in 2024, Yamasaki joined the cast of the anime adaptation of the popular short story 5-Oku-Nen Button. She voiced the character Emo-kun, an AI who gradually develops emotions, in the series' 13th episode, which aired on September 30, 2024. Her other anime roles during this period include minor roles in One Piece as a child and a girl, and in Dandadan as a female student.

Outside of her voice acting work, Yamasaki's personal interests include taking walks with her dog and visiting cafes. She also possesses skills in the Korean language.