Sefströmkammen is a mountain ridge in Nordenskiöld Land at Spitsbergen, Svalbard.
It has a length of about six kilometers, extending along Aurdalen from Søre Aurdalsbre, and comprises the peak of Hamretoppen and other peaks.
The ridge is named after Swedish geologist Nils Gabriel Sefström.
[1] The glacier-dammed Kamvatnet is located between Sefströmkammen and Fridtjovbreen.
[2] The lower ridge of Flathaugen is proximate to Sefströmkammen.