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The Gorner Glacier () is a valley glacier found on the west side of the Monte Rosa massif close to Zermatt in the canton of Valais, Switzerland. It is about long (2014) and wide. The entire glacial area of the glacier related to Gorner Glacier is (2007), which makes it the second largest glacial system in the Alps after the Aletsch Glacier system; however, in length it ranks third behind the Aletsch and Fiescher Glacier.
The Grenzgletscher () between the central Monte Rosa massif and the Liskamm to the south is nowadays the main contributor to the lower Gorner Glacier. The Gorner Glacier's upper part is almost already disconnected from its lower part. The former tributaries Breithorngletscher, Triftjigletscher, and Unterer Theodulgletscher lost their connections to the Gorner Glacier during the twentieth century; the Unterer Theodulgletscher became disconnected in the 1980s.
There are also notable surface features including crevasses and "table top" forms where large surface boulders have been left stranded above the glaciers surface. These tabular rocks are supported by ice that the boulder has sheltered from melting that has affected the more exposed surrounding ice.
The glacier as well as the surrounding mountains can be seen from the Gornergrat (), connected from Zermatt by the Gornergrat Railway.
As of about 2015, the Gorner Glacier had retreated to the point where it lost touch with its main tributary: the Grenzgletscher () on the south side of the Monte Rosa massif. The Gorner Glacier proper is found on the north side. Now the prominent flow visible from Gornergrat is properly called the Grenzgletscher and can no longer be considered part of the Gorner Glacier. The Monte Rosa Glacier in the middle has also lost touch with the Gorner Glacier. This can be seen in a comparison of photographs over the years:
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