Kirsten Day is an American actress known for her work in voiceover for animation and video games. Born in Covington, Kentucky, and raised in Southern Indiana, she developed an interest in performance from a young age. She pursued this passion formally at Ball State University, where she earned a Bachelor of Science degree in Musical Theatre and Acting.

Following her graduation, Day moved to New York City to begin her professional career on stage. She spent a decade there, performing in four national tours. Her theater credits include originating the role of Alicia in Nickelodeon's first national tour of Go Diego Go, Live! and touring the country as the title character in TheatreWorks USA's production of The Life and Times of Junie B. Jones. After her time in New York, she relocated to Los Angeles to expand her career into television, film, and voiceover.

In the realm of voice acting, Day is recognized for a wide range of roles. She is perhaps best known for voicing the character Skipper Roberts in the long-running animated series Barbie Dreamhouse Adventures and its associated specials, including Skipper's Big Babysitting Adventure. Her work in video games is also prominent, with one of her notable roles being the voice of Constance Von Nuvelle in the critically acclaimed Nintendo game Fire Emblem: Three Houses, a character she has also reprised in related titles such as Fire Emblem Heroes and Fire Emblem Warriors: Three Hopes. Her other video game credits include voicing Kelly Porter in Madden NFL 21, additional voices in Octopath Traveler, and characters in games like Arena of Valor and War of the Visions: Final Fantasy Brave Exvius.

In anime, Day has provided voices for several English adaptations. She is the voice of Eva in the first two seasons of the anime series Ascendance of a Bookworm, a role that is credited as Effa in the third season. Her other anime credits include roles in the popular series Demon Slayer: Kimetsu no Yaiba, where she voices various background characters, as well as roles in Magia Record: Puella Magi Madoka Magica Side Story and the Netflix animated films Maboroshi and My Oni Girl.

Beyond performance, Day is also a writer and producer. She wrote, directed, and produced the award-winning web series #MarriedLife. She shares her expertise by teaching voiceover at Sound On Studio, an online voiceover studio she co-owns with her husband, Emmy Award-winning sound engineer Steve Bucino.