Knut Fredrik Idestam (28 October 1838, Tyrväntö, Grand Duchy of Finland – 8 April 1916, Helsinki, Grand Duchy of Finland) was a Finnish mining engineer and businessman, best known as a founder of Nokia.

In May 1865, Idestam obtained a permit to construct a groundwood paper mill at Tampere, Finland. The mill began operations in 1866. In 1871, Idestam and Leo Mechelin founded Nokia Ltd.^[1] and moved the company's operations to the city of Nokia, Finland.

He was buried in the Hietaniemi Cemetery in Helsinki.^[2]