Jarl Werner Söderhjelm (26 July 1859 – 16 January 1931) was a Finnish-Swedish linguist, researcher of literary history and diplomat.
Through his family connections, he was exposed to a variety of languages and he took an early interest in literature.
He applied for the professorship of aesthetics and modern literature in 1910, but was beaten to it by Yrjö Hirn.
After the independence of Finland, he served as Director in the Finnish News Agency in Copenhagen from 1918 to 1919 and as Envoy to Stockholm from 1919 to 1928.
His youngest son, J. O. Söderhjelm, served as a Minister of Justice during the Winter War.