Qun (Chinese: 裙; pinyin: qún; Jyutping: kwan4; lit. 'skirt'), referred as cháng (裳) prior to the Han dynasty, chang (常) and xiachang (下常), and sometimes referred as an apron, is a generic term which refers to the Chinese skirts used in Hanfu, especially those worn as part of ruqun, and in Chinese opera costume.

The qun and its predecessor, the chang, along with the upper garment called yi and the trousers called ku, are all indigenous clothing of the Zhongyuan, which conformed to the fashion style of the Chinese civilization in ancient times. Both the qun and the chang, were both typically in the form of a wrap-around skirt like an apron. However, throughout Chinese history, the chang eventually evolved into the qun; and the qun evolved in diverse shapes, styles, and construction throughout the succeeding dynasties. The qun continued to exist even in the Republic of China.

Several forms of ancient style qun regained popularity in the 21st century following the Hanfu Movement; this also inspired the development of new styles of qun with modern aesthetics and shapes.

In a broad sense, the Chinese character qun (裙) is a synonym for the word qúnzi (裙子); both of these are generic words for skirts in China.

In ancient China, the Chinese character chang (裳) can refer to "lower garments," which included both the trousers called ku and the qun skirt also called chang which also use the same character 裳. The term qun with the Chinese character 帬 also referred to skirt . According to the Fangyan, the qun (帬) was called pei (帔) in the area of Wei and Chen; it was also called bai (襬) by some people from the east of the Pass. The Shuowen jiezi also explains that the term qun which uses the character 帬 is the same as the term xiachang which uses the characters 下常. It also explains that the chang, which uses the Chinese character 常, is a skirt by using the term xiaqun with the characters 下帬.

There are also specific terms which are related to the qun, such as chenqun (衬裙; 'inner skirt / petticoat') and danqun. The danqun is a generic term which refers to unlined skirts. The chenqun is a generic term which typically refer to a form of inner skirt.

In the ancient times, the qun was referred as chang and existed even prior to the creation of the trousers called ku. The chang appeared on unearthed artifacts dating as early as the Shang dynasty; the chang eventually evolved into what became known as the qun.

In the Warring States period, men could also wear short skirts similar to a kilt.