Masherbrum (also known as K1) is located in the Ghanche District, Gilgit Baltistan of Pakistan. At 7,821 metres (25,659 ft) it is the 22nd highest mountain in the world and the 9th highest in Pakistan. It was the first mapped peak in the Karakoram mountain range, hence its name.

The meaning of the name "Masherbrum" is not entirely clear. It may come from mashadar (muzzle-loading gun) plus brum (mountain), from the resemblance of the double summit to an old muzzle-loader. It may also come from masha (queen or lady), giving "queen of peaks." Other meanings have also been suggested.

Masherbrum is the highest peak of the Masherbrum Mountains, a subrange of the Karakoram range. It is a large and striking peak, which is somewhat overshadowed by the nearby 8,000 metres (26,000 ft) peaks of the main range of the Karakoram which includes four of the fourteen Eight-thousanders, namely K2, Gasherbrum I, Broad Peak and Gasherbrum II.

The Masherbrum Mountains lie to the south of the Baltoro Glacier and the main range of the Karakoram lies to the north of the Baltoro. The main range is the continental divide of southern Asia. Rivers to the south flow into the Arabian Sea. Rivers to the north flow to the Yellow Sea.

The Baltoro Glacier is the route most commonly used to access the 8000m peaks of the Karakoram, and many trekkers also travel on the Baltoro. Masherbrum also lies at the north end of the Hushe Valley, which serves as the southern approach to the peak.

In 1856, Thomas Montgomerie, a British Royal Engineers lieutenant, noticed a tall mountain in the Karakorams and called it K1 (denoting peak 1 of the Karakorams). To the local people of the area, it is known as Masherbrum.

Masherbrum was reconnoitered in 1911 by Dr. William H. Workman and his wife Mrs. Fanny Bullock Workman. It was first attempted in 1938 from the south; the attempt failed just short of the summit.

After two more failed expeditions, in 1955 and 1957, Masherbrum was first climbed in 1960 by George Irving Bell and Willi Unsoeld, part of an American-Pakistani expedition led by Nick Clinch. They succeeded in climbing the southeast face route that had stymied the earlier parties.

The Himalayan Index lists three additional ascents and six additional failed attempts on Masherbrum. The ascents include two by additional routes, the NW Face and the NW Ridge/N Face.

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