Saki Miyashita is a Japanese voice actress born on December 4. While some sources list her birthplace as Nara Prefecture and others as Kanagawa Prefecture, she began her career after passing the sixth Sigma Seven Voice Actor Audition in 2015. She became affiliated with the agency Sigma Seven e in April 2016, marking her professional debut. Her early work included minor roles in series such as Aikatsu Stars!.

Miyashita's first leading role came in 2018 when she was cast as Kanata Higa in the television anime Harukana Receive. For this series, she also performed the opening theme song Fly Two Blue with her co-star Kana Yūki. This role helped establish her in the industry, leading to a succession of notable character voices. In 2019, she voiced Miki Takekasa in After School Dice Club and performed the series' ending theme, On the Board, with her fellow cast members. The same year, she also played Mayo Ojōsa in Hitori Bocchi no Marumaru Seikatsu.

The year 2021 was particularly active for Miyashita, featuring roles as Suzuno in LBX Girls and as the enigmatic Siesta in The Detective Is Already Dead. She continued to build her filmography with the role of Shiori Sakurazaka in the 2022 series More Than a Married Couple, But Not Lovers and as Yuika Hibuchi in The Girl I Like Forgot Her Glasses in 2023. In 2024, she joined the cast of the second season of Tower of God, providing the voice for the character Mana, known in some sources as Yeo Miseng. Other roles from this period include Seras Ashrain in Failure Frame and a young Mi-Kun in A Terrified Teacher at Ghoul School!.

In addition to anime, Miyashita has lent her voice to numerous video game projects. Her game roles include Erika Aoi in Heaven Burns Red, the character Still in Love in the multimedia franchise Uma Musume Pretty Derby, and Kaori in Paradigm Paradox. She is also known for her work in dubbing foreign content and narration for projects such as an Osaka City Science Museum planetarium show.

Miyashita was with Sigma Seven e until March 31, 2022. After a brief period as a freelancer, she joined the Tokyo Actor's Consumer's Cooperative Society, commonly known as Haikyō, on July 1, 2022, where she is currently affiliated. She has a reported height of 151 cm and holds qualifications in calligraphy and aromatherapy. Beyond voice work, she is active in fan engagement through her YouTube program, Saki Miyashita's Streaming Club.