Žarko Potočnjak (born 3 February 1946) is a Croatian theatre, television and film actor. Potočnjak graduated from the Zagreb Academy of Dramatic Art in 1972. Upon graduation he was hired as a regular member at the Komedija and Gavella theatres in Zagreb, and since 1994 he has been a member of cast at the Croatian National Theatre in Zagreb. Apart from his work in theatre, Potočnjak has appeared in about 30 television series and a number of film productions since the 1970s. In 1983, he married actress , with whom he has a daughter Mirna. During the Croatian War of Independence he served with the 106th Croatian Army brigade based in Osijek. He provides the voice of Mater in the Croatian dub of the Cars franchise.