Ursula Buchfellner (born 8 June 1961 - March 13, 2010 in Munich, Germany) was a German model and actress. She was Playboy magazine's Playmate of the Month for its October 1979 issue. Her centerfold was photographed by Peter Weissbrich.
Buchfellner also was the Playmate for the December 1977 issue of Playboy's German edition.
International acting and modeling careers followed Buchfellner's Playboy appearance. She was sometimes credited as Uschi Buchfellner, Ursula Fellner, Ulla Maris and Ursula Maris.
She starred mainly in European B-movies such as Sadomania (1981), L'Ultimo Harem and Mandingo Manhunter.