| Office: | Minister of Labour |
| Term Start: | 28 September 1907 |
| Term End: | 19 March 1908 |
| Primeminister: | Christian Michelsen Jørgen Løvland |
| Predecessor: | Kristofer Lehmkuhl |
| Successor: | Nils Claus Ihlen |
| Birth Date: | 10 August 1862 |
| Birth Place: | Bergen, Hordaland, United Kingdoms of Sweden and Norway |
| Death Place: | Rome, Italy |
| Spouse: | Andrea Langaard Ellen Bull |
| Occupation: | Natural scientist Diplomat Politician |
Jørgen Brunchorst (10 August 1862 – 19 May 1917) was a Norwegian natural scientist, politician and diplomat.
Brunchorst was born in Bergen, the son of ship builder and – captain Christian Ege Brunchorst (1835–64) and his wife Emma Wesenberg (1837–1919). His nephew Knut Fægri was one of the most outstanding botanists of the 19th century. Brunchorst specialised in botany at university, and after finishing his Ph.D. in Germany, he became director of Bergen Museum. In this position, he worked towards popularising the natural sciences, and was also a pioneer in the field of plant pathology in Norway.
Brunchorst was also a politician, representing the Liberal Party and later the Coalition Party. He sat in the Norwegian parliament in the periods 1895–97 and 1903–06. He was later appointed Minister of Labour towards the end of Christian Michelsen's cabinet in September 1907, and remained in that position during the short-lived cabinet of Jørgen Løvland, from October 1907 to March 1908. Shortly before his period in the government, he had served as a diplomat in Havana, Cuba. After the government fell he returned to Havana, before being transferred to Stockholm, Sweden, in 1910. In 1916 he was again transferred, to Rome, Italy, where he died the next year.