Glenn was born and raised in Phoenix, Arizona, with her sister Amanda. Her father, Mark, is of German, Scottish and Irish descent, and her mother, Sumiko, is Japanese. Glenn began acting at the Valley Youth Theatre in Phoenix, along with several other local theaters, when she was in the fifth grade.
She was educated at Desert Vista High School, and the Interlochen Arts Academy boarding school in Interlochen, Michigan. Glenn attended the Boston Conservatory for a year as a musical theatre major, but dropped out after she was cast in the touring company of Spring Awakening. She is in a relationship with actor Sean Grandillo.
Kimiko Elizabeth Glenn is an American actress and singer, known for portraying Brook Soso in the Netflix series Orange Is the New Black, and Dawn Williams in the Broadway musical Waitress.
For Disney, she voiced Cinder in Sofia the First, Lena in the new DuckTales series and Tomiko in Elena of Avalor.