Kati Saara Murutar (née Vasar, 1988-2010 Murutar, 2010-2011 Murdmaa, 2011-2020 Kati Saara Vatmann, 2020-2021 Kati Saara Borodina; born March 21, 1967) is an Estonian prose writer, screenwriter and journalist.

Murutar was born in Tallinn to opera tenor Harri Vasar and Ille Vasar. Her older half-brother was the artist Aarne Vasar (:et) and her younger brother is opera baritone Lauri Vasar. She is one of the authors of television series Õnne 13 (partly based on her book series Õnne tänava lood I-III).