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Huqin (Chinese: ; pinyin: ) is a family of bowed string instruments, more specifically, a spike fiddle popularly used in Chinese music. The instruments consist of a round, hexagonal, or octagonal sound box at the bottom with a neck attached that protrudes upwards. They also usually have two strings, and their soundboxes are typically covered with either snakeskin (most often python) or thin wood. Huqin instruments usually have two tuning pegs, one peg for each string. The pegs are attached horizontally through holes drilled in the instrument's neck. Most huqin have the bow hair pass in between the strings. Exceptions to having two strings and pegs include variations of huqin with three, four, and sometimes even more than five. These include the zhuihu, a three stringed huqin, the sihu, a huqin of Mongolian origin, and the sanhu, a lesser-known three-stringed variation.
The most common huqin are the erhu, which are tuned to a middle range; zhonghu, which is tuned to a lower register, and gaohu, which is tuned to a higher pitch. The lowest pitched huqins include the dahu and gehu. The highest pitched huqin is the jinghu, used in the Beijing opera. Over eighty types of huqin instruments have been documented.
Huqin instruments are believed to have come from the nomadic Hu people, who lived on the extremities of ancient Chinese kingdoms, possibly descending from an instrument called the Xiqin (), originally played by the Mongolic Xi tribe. Like the people of China, Mongolian people also have cultural and ethnic heritage of the ancient Hu nomads, and the Mongol version of the xiqin, known as the khuuchir, is testament to this shared heritage.
In the 20th century, large bass huqin such as the dihu, gehu, and diyingehu were developed for use in modern Chinese orchestras. Of these, the gehu and diyingehu would be analogous to Occidental cellos and double basses respectively, and were designed to have a timbre that would blend in with the sound of traditional huqin. These instruments generally have four strings and fingerboards, and are played in a similar manner to cellos and double basses, and are very different from the traditional huqin.