Carl Frederik Tietgen (19 March 1829 – 19 October 1901) was a Danish financier and industrialist. The founder of numerous prominent Danish companies, many of which are still in operation today, he played an important role in the industrialisation of Denmark. Notably also forming conglomerates, several of Tietgen's companies attained a monopoly-like status, which cemented their durability. A dedicated Grundtvigian, Tietgen made the completion of the Marble Church which he financed at his own expense.