Lavínia Gutmann Vlasak (born June 14, 1976) is a Brazilian actress and a former model. Vlasak was born in Rio de Janeiro, daughter of Chief Financial Officer Robert Vlasak and homemaker Eugênia Gutmann.

The surname Vlasak is of Czech origin. It came from her paternal grandfather who, however, was born in Austria. In addition, Lavínia has German ancestry from both father and mother.