Sonja Lapajne Oblak (July 15, 1906 – September 29, 1993) was a Slovenian architect. She was the first Slovenian woman to graduate as a civil engineer from the Faculty of Technology in Ljubljana and Slovenia's first female urban planner. She was a partisan fighter during the Second World War and survived incarceration in Ravensbruck concentration camp, before playing a part in rebuilding Yugoslavia in the post war period.