Külli Palmsaar (born 1 October 1966) is an Estonian actress.

Palmsaar was born in Tallinn, Estonia, on 1 October 1966 and graduated from the Tallinn State Conservatory (now, the Estonian Academy of Music and Theatre) in 1988. Among her graduating classmates were actors Dajan Ahmet, Epp Eespäev, Merle Jääger, Piret Kalda, Elmo Nüganen, Anne Reemann, Rain Simmul, Artur Talvik, Hendrik Toompere Jr. and Raivo E. Tamm.

Palmsaar worked as an announcer for the Eesti Televisioon from 1989 to 1996. She performed theatre roles in multiple venues including the Estonian National Puppet Theatre, Rakvere Theatre, Tallinn City Theatre, Estonian Drama Theatre and Theater der Nacht. In 2009, she co-founded the First Hand Theatre with Danish puppeteer Hans Hartvich-Madsen.

Palmsaar also starred in films and TV series such as Õnne 13 , Kättemaksukontor, Saladused, Härra Lapsti lasteteater, Ühikarotid, Parim enne, Viimane võmm and Vidiots TV.