Paul Jakob Deussen (January 7, 1845 – July 6, 1919) is a German Orientalist and Sanskrit scholar.
He is influenced by Arthur Schopenhauer.
He is also a friend of Friedrich Nietzsche and Swami Vivekananda.
In 1911, he founds the Schopenhauer Society (Schopenhauer-Gesellschaft).
He is the first editor, in 1912, of the scholarly journal Schopenhauer Yearbook (Schopenhauer-Jahrbuch).
Deussen, who 'Sanskritises' his name to ‘Deva-Sena’ as a mark of his admiration for Hinduism, is one of the distinguished roll of Europeans who — often with lyrical admiration — participate in the scholarly Western discovery of Sanskrit and Hinduism that takes place in British India, Germany, France and England.