Viktor Hugo Suolahti (7 October 1874 in Hämeenlinna – 23 February 1944 in Helsinki) was a Finnish politician, linguist and philologist.
Suolahti passed his matriculation examination in 1892 and received his master's from the University of Helsinki in 1896.
In 1901, he became a docent of German Philology at the University of Helsinki and in 1911, he became a professor of the same subject, a post he occupied for more than 40 years, until 1941.
Suolahti specialized mainly in etymology and his work on words and vocabulary had a significant impact on Finnish research pertaining to German Philology.
First, he served as vice-rector of the University of Helsinki from 1917 to 1923, and then as rector from 1923 to 1926 and finally as chancellor from 1926 to 1944.