Ole Christian Marentius Thullin Thams (27 February 1836 – 26 July 1907) was a Norwegian merchant and industrialist.

He was the son of timber trader Wilhelm August Thams (1812–1884) and Ida Olava Mandskow (1812-1889).

Thams grew up in Fredrikstad and gained a commercial education, partly abroad.

The primary of facilities were destroyed by fire in 1872 after which Marentius Thams took over management of the re-built operation.

[1] In time, Marentius further developed his father's businesses to become the country's largest of its kind.