Gjellerups Forlag, was a publishing house and bookshop located in Copenhagen, Denmark.

[1] Early publications of fiction included Dansk Folkebibliotek, a series of translations of international classics for 25 øre published in collaboration with P. Hauberg & Co, as well as works by new Danish writers such as Martin Andersen Nexø and Johan Skjoldborg.

With the opening in 1900 of the new Polytechnical College on the other side of the square, Gjellerup began to specialize in technical textbooks and other scientific literature.

In 1903, his fictional portfolio was sold to E. Jespersens Forlag and from then on the publishing hose focused exclusively on school books and other nonfiction.

The bookshop is merged into Harcks Boghandel at the corner of Fiolstræde and Nørre Voldgade, which has been renamed to Hack og Gjellerup.