Hendrik Nicolaas Werkman (commonly called H.N. Werkman; 29 April 1882 – 10 April 1945) was an experimental Dutch artist, typographer and printer. He set up a clandestine printing house during the Nazi occupation (1940–45) and was shot by the Gestapo in the closing days of the war.
Werkman was born in Leens, in the province of Groningen. He was the son of a veterinary surgeon who died while he was young, after which his mother moved the family to Groningen. In 1908, he established a printing and publishing house there that at its peak employed some twenty workers. Financial setbacks forced its closure in 1923, after which Werkman started anew with a small workshop in the attic of a warehouse.
Werkman was a member of the artists' group De Ploeg ("The Plough"), for whom he printed posters, invitations and catalogues. From 1923 to 1926, he produced his own English-named avant-garde magazine The Next Call, which, like other works of the period, included collage-like experimentation with typefaces, printing blocks and other printers' materials. He would distribute the magazine by exchanging it for works by other avant-garde artists and designers abroad and so kept in touch with progressive trends in European art. Among the most fruitful contacts were with Theo van Doesburg, Kurt Schwitters, El Lissitzky and Michel Seuphor, the last of whom exhibited a print of his in Paris.