Der brænder en ild (A Fire is Burning) is a 1962 Danish family-comedy-drama film based on the 1920 book of the same name by novelist Morten Korch. Directed by Alice O'Fredericks and Robert Saaskin, the movie stars Poul Reichhardt, Bodil Udsen, Ib Mossin and William Rosenberg.

The film is set in 1920 and follows the return of Martin, a charismatic outdoorsman who returns to his old farm and home after working abroad in Greenland for nine years. He reunites with his former love Martha, but is heartbroken to discover she ended up marrying his old friend Just. Although having initially planned to use his savings to start up his own machine station, Martin decides to help out the hardworking Just in settling his many debts and loans. Just, however, is extremely hesitant to accept financial aid from a former boyfriend of Martha's. Subplots concern the romantic interest of Henrik and Jesper, both farmworkers who develop a feud over a woman.

The motion picture premiered in Copenhagen and Aarhus cinemas on 12 February 1962 and became a critical and major commercial success. Production and distribution was done by ASA Film. Like several other films adapted by Korch's popular family novels, the film developed a cult following and is regarded as one of the best from the Korch-era.