Katrin Valkna (until 1994 Katrin Tuuksam; born November 8, 1970 in Audru) is an Estonian actress.

She graduated from Kilingi-Nõmme Middle School in 1989 and from Tallinn Pedagogical University in 1993, majoring in performance management.

She worked at the Endla theater from 1993 to 2012. She was a founding member of the project theater Ajateater (2011). Later she worked as a freelancer.

She has played in the film "Noorelt õpitud" (1992, Tallinnfilm) and in the TV series "M Klubi", Klass: elu pärast.