Marcus Frederik Steen Grønvold (5 July 1845 – 10 October 1929) was a Norwegian painter.
He was a realistic portrait painter and also a landscape artist.
Grønvold was born in Bergen, Norway the son of vicar Christian August Grønvold (1810–1889), and the brother of painter Bernt Grønvold and educator Didrik Grønvold and third cousin of Hans Aimar Mow Grønvold.
He studied at the Art Academy in Copenhagen between 1866 & 1869 and in Munich under Karl Piloty between 1874 & 1877.
Grønvold finally settled in Munich in 1881 and has two works in the National Gallery of Norway.