Kay Jensen is an alias used by the American voice actress Kari Wahlgren. Under this pseudonym, she has provided English-language voices for numerous anime series, particularly during the early to mid-2000s.

Wahlgren, born July 13, 1977, in Hoisington, Kansas, developed an interest in voice acting from a young age. She graduated from the University of Kansas with a Bachelor of Arts in Theater in 1999 before moving to Los Angeles in 2000 to pursue an acting career. After initially seeking on-camera work, she transitioned to voice-over, where her theatrical training, including work with Shakespearean dialogue, proved to be an asset.

Under the name Kay Jensen, she voiced several of the specific roles mentioned. In the series Heat Guy J, she is credited as Kay Jensen for the role of Kyoko Milchan in the English dub. Her filmography also includes the role of Kotoko in Chobits and Cinnamon in A Little Snow Fairy Sugar, both credited under the Kay Jensen alias. Another early credit under this name was as Cinnamon in A Little Snow Fairy Sugar Summer Special. While her extensive voice work is well-documented, a specific credit for the role of Monkey in The Princess of the Desert Kingdom could not be verified within the available information.

Beyond these specific roles, Kari Wahlgren's career as a voice actress is extensive and acclaimed. Her debut anime role was as Haruko Haruhara in FLCL, a performance that launched her career in the industry. She has since gone on to land major roles in a wide array of popular series, often working under her own name. Some of her most notable performances include Robin Sena in Witch Hunter Robin, Lavie Head in Last Exile, Fuu in Samurai Champloo, Pacifica Casull in Scrapped Princess, Saya Otonashi in Blood+, Kagami Hiiragi in Lucky Star, Saber in the Fate series, and Celty Sturluson in Durarara!!.

Her work has garnered significant recognition, including being named Voice Actress of the Year in 2012 by the website Behind the Voice Actors. In 2023, she won a Children's and Family Emmy Award for Outstanding Voice Performer in a Preschool Animated Program for her work in the series SuperKitties.