Philips Christiaan Visser (May 8, 1882 – May 3, 1955) was a Dutch geographer, explorer, mountaineer, diplomat and glaciologist. Visser was mostly known for his travel reports and lectures about his expeditions to the Karakoram Mountains in the far north of then British India.

Visser was born on May 8, 1882 in Schiedam, where his father was the owner of a small restaurant. After completing the HBS, he followed a trade education and became a partner in this company. After a trip to Switzerland, Visser became fascinated by high mountains and alpinism. He climbed several peaks in the Alps and wrote a book about nature and topography of the high mountain, which for the first time proved his talent for writing. In 1912, he married Jenny Hooft, who shared his fascination with the mountains.

The couple undertook an expedition to the Caucasus in 1914 to return to Russia after the outbreak of the First World War. Back in the Netherlands, Visser gave lectures on his journey. In 1916 a second trip to Russia followed. After the war, Visser worked as an attaché in the Dutch parish in Stockholm in 1919. He was able to explore Finland in the following years, to make another trip to Switzerland and to visit the Arabian Peninsula. In Stockholm, he met the well-known Swedish explorer Sven Hedin and discovered the idea of exploring the Karakoram. This mountain range in the middle of Asia was still largely empty on maps. This fascinated Visser.

Visser and his wife organized four expeditions to Karakoram between 1922 and 1935, which at that time formed the inhospitable border between British India, Tibet and Central Asia. The couple was accompanied by the Swiss mountain guides Franz Lochmatter and Johann Brantschen. During the first expedition in 1922, on eastern part of the mountain, around the Saser Muztagh, was explored by the group.

With the same participants, a second expedition followed between November 1924 and January 1926, to the area north of the Great Karakoram, which at the time belonged largely to the Hunza State. To investigate the animal world, biologist Lex Sillem was part of the third Karakoram expedition of the Fishermen (between February 1929 and January 1931). During this expedition, Sinkiang was overwhelmed by visiting Kashgar and Yarkand.

The expeditions performed pioneering work for later alpinists in the Karakoram. One expedition that climbed some lower peaks and explored the routes that would be used by later climbers to clamp the eight-thousand-one in the area. With the help of Afraz Ghul Khan and Muhammad Akram of the Survey of India, the extremely inhospitable Karakoram was accurately mapped. Visser studied the location, shape and flow of the glaciers while his wife documented the local flora.

Visser findings found that the Karakoram glaciers hold the middle between those in the Alps, which originate in firnbekkens, and those in the Pamir (Sinkiang and Russian Turkestan), which are mainly fed out of avalanches. This as the first time these glaciers were ever mapped.

Back in the Netherlands, work was started on detailed scientific expedition reports published in different volumes between 1923 and 1940. Besides glaciology, Philips Visser also took account of scientific dissertations on the population and meteorology of the area. In addition, he gave lectures and wrote articles in newspapers, giving the couple publicity.