Tervakoski Oy

Tervakoski Oy is a Finnish paper industry company. Its paper mill, founded in 1818, is located in the village of Tervakoski in Janakkala, Tavastia Proper. Since 1999, it has been owned by the Austrian company Delfort Group.

By the end of 2022, the company made €207,9 million in turnover and its result was €13 million with the company's net profit percentage being 6.28%.

In the years 1956–1984, the company gained a controversial reputation when a paper mill polluted Tervajoki River and Lake Kernaala with PCB compounds. PCB concentrations are still so high that restrictions have been placed on the use of fish in the lake.