Hendrik Jan Bulthuis (15 September 1865, in Warffum – 27 April 1945, in Noordbroek) was a Dutch customs official, author, and translator of more than thirty works into Esperanto.
He engaged in much correspondence with Esperantists of other countries, did much Esperanto publicity, especially in The Hague, taught courses, and served as the secretary of the examinations committee from its establishment until the present.
Starting in 1907, when his translation from French of Two Tickets (Du Biletoj) by Florian appeared, he published 35 books and brochures.
The Children of Orpheus, 1923, despite some implausibilities, marked its author as a clear stylist and a person of outstanding storytelling talent.
That was followed by the naively simple Joseph and Potifer's Wife, 1926, and The Fuzzy Hand, 1928, an intimately aware picture of Dutch peasant life, in which Bulthuis's inclination for non-veresimilitude is still evident.
As a poet Bulthuis published only The Two Ships (La Du Sxipoj), 1909, for which he received a prize from Barcelona.
The most extensive commentary on Bulthuis's works is by Nekrasov, who wrote extensive critiques of both his original novels from a Marxist viewpoint for the ante-schism "La Nova epoko" (The New Epoch) (Oct. 1929-Feb. 1930) and for the post-schism "La Nova Etapo" (The New Stage) (1932).