Otto Manninen (13 August 1872, Kangasniemi – 6 April 1950, Helsinki) was a Finnish writer, poet, and a celebrated translator of world classics into Finnish language.
Along with Eino Leino in the early 20th century, he is considered as a pioneer of Finnish poetry.
Manninen translated the works of Homer, Sophocles, Euripides, Heine, Ibsen, Petofi and Runeberg into Finnish.