Li or li may refer to:

• Li (Confucian), the Confucian concept of ritual
  • Li (Neo-Confucianism), philosophical concept of principle
• Li people, an ethnic group of China
• Li (unit), a traditional Chinese unit of length, often used when discussing distance
• Prunus salicina (Pinyin: lǐ), a Chinese species of plum
• Li, Norway, a village in Norway
• Amphoe Li, a district in Lamphun Province, northern Thailand
• Li, Lamphun, Thailand, a village and subdistrict of Thailand
• Li River, rivers in China and Thailand
• Li (surname), a Chinese surname sometimes transliterated Lee
  • Li (李)
  • Lí (黎)
  • Lì (利)
• 51 (number), written as "LI" in Roman numerals
• Li or cash (mass), a Chinese weight unit for candareen
• Li, the polylogarithm function
• Li, the logarithmic integral
• Li County (disambiguation), several counties in China
• 954 Li, an asteroid
• License number plate of German district Lindau

.li is the Internet country code top-level domain (ccTLD) for Liechtenstein. It was created in 1993. The domain is sponsored and administered by the Hochschule Liechtenstein (University of Applied Sciences of Liechtenstein) in Vaduz, but domain names with the extension can also be registered with SWITCH, administrator of Switzerland's .ch ccTLD. There are no requirements to apply for the extension. Registrations of internationalized domain names have been accepted since March 2004.

'Li' (禮 pinyin: Lĭ) is a classical Chinese word which finds its most extensive use in Confucian and post-Confucian Chinese philosophy. Li encompasses not a definitive object but rather a somewhat abstract idea; as such, it is translated in a number of different ways. Most often, li is described using some form of the word 'ritual' (as in Burton Watson's 'rites', and Henry Rosemont and Roger Ames' 'ritual propriety'), but it has also been translated as 'customs', 'etiquette', 'morals', and 'rules of proper behavior', among other terms.

Li Dongyang (, 1447-1516 AD) was a Ming Dynasty scholar born in Chaling city, Hunan Province.