Dahlbreen is a glacier in Oscar II Land at Spitsbergen, Svalbard. It is named after whaler Thor Dahl.[1] The glacier has a length of about fifteen kilometers, extending from Løvenskioldfonna to Forlandsundet. Among its tributary glaciers are Ujamnbreen, Bærumbreen and Fjelgbreen.[1] Retreatment of the glacier has formed the bay of Dahlbrebukta.[2]