Olav Johan Sopp

Olav Johan Sopp (né Johan Oluf Olsen; 6 October 1860 – 14 August 1931) was a Norwegian mycologist. He was a pioneer of Norwegian and international mycological research. He was the first to suggest classifying fungi as belonging to neither plantae nor animalia, but to a third kingdom. He also contributed to the development of the Norwegian dairy and brewery industry.