Juhan Ulfsak (1973) is a currently a guest actor at Theatre NO99. He is a actor and director long time associated with Von Krahl Theatre in Tallinn, Estonia. He finished his studies in acting at the Culture College in Viljandi, Estonia in 1995. From 1997 he has been an actor at Von Krahl Theatre.

Over the years he has worked with a wide array of directors and groups such as Peeter Jalakas, Mati Unt, Tiit Ojasoo, Sasha Pepelyayev, Kristian Smeds, Teemu Mäki and Showcase Beat Le Mot. For his work as an actor he has been awarded several prizes, notably Best Actor at the Estonian annual theatre awards in 2012 (together with Erki Laur). Has is also a prominent film actor having worked with Veiko Õunpuu, Rainer Sarnet and Pirjo Honkasalo.

In recent years he has worked extensively as a theatre director at Von Krahl Theatre, Theatre NO99 and most recently Estonian Drama Theatre. He has staged works by Lars von Trier, Sarah Kane, Michel Houellebecq and Taavi Eelmaa.

He appears in productions:
NO49 The Truth I've Been Longing For
NO51 My Wife Got Angry

His production at Theatre NO99:
NO53 The Case of the Lost Friend