Katherine LaNasa (born December 1, 1966) is an American actress, former ballet dancer and choreographer. She starred in films Jayne Mansfield's Car, The Campaign, and The Frozen Ground. On television, LaNasa had a leading role in the NBC sitcom Three Sisters (2001–2002) and Truth be Told (2019-present), appeared in recurring roles on Judging Amy, Two and a Half Men, Big Love and Longmire, and starred in the short-lived dramas Love Monkey (2006), Deception (2013), Satisfaction (2014–15) and Imposters (2017–18). In 2020, LaNasa portrayed Gloria Grandbilt in the musical dramedy series Katy Keene.

Early life
LaNasa was born in New Orleans, Louisiana, the daughter of Anne (née Hardin) and Dr. James J. LaNasa Jr., a surgeon.

She began dancing at the age of 12, and at the age of 14, she was admitted to the North Carolina School of the Arts in Winston-Salem, North Carolina. After an apprenticeship with Milwaukee Ballet, LaNasa danced with Salt Lake City's Ballet West and the Karole Armitage Ballet.