Martinbreen is a glacier in Nathorst Land at Spitsbergen, Svalbard.
It is named after Swedish botanist Anton Rolandsson Martin.
The glacier has a length of about five kilometers.
It is located between the ridges of Mjellegga and Breskarvet, and debouches into the valley of Davisdalen.
This article about a glacier in Spitsbergen is a stub.