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.