Lauritz Dorenfeldt Jenssen (4 February 1801 – 7 June 1859) was a Norwegian businessman and politician.
He was born in Throndhjem[1] as the son of businessman Matz Jenssen (1760–1813) and his wife Anna, née Schjelderup Dorenfeldt (1763–1846).
His older brothers Jens Nicolai and Hans Peter ran the family company Jenssen & Co; Jens Nicolai later founding a rivalling company Jenssen & Sønner in 1837.
In 1836 he bought the farm Ranheim in Strinden for 23,000 Norwegian speciedaler, and ran a "significant" industrial company here.
[4] Their son Lauritz established the paper factory Ranheims Papirfabrik,[2] and also served as a politician.