A Chinese character or Han character ( ) is a logogram used in writing Chinese, Japanese, sometimes Korean, and formerly Vietnamese.

The number of Chinese characters contained in the Kangxi dictionary is approximately 47,035, although a large number of these are rarely used variants accumulated throughout history. Studies carried out in China have shown that full literacy requires a knowledge of between three and four thousand characters.

In the Chinese writing system, each character corresponds to a single spoken syllable. A majority of words in all modern varieties of Chinese are poly-syllabic and thus require two or more characters to write. Cognates in the various Chinese languages/dialects which have the same or similar meaning but different pronunciations can be written with the same character. In addition, many Chinese characters were adopted according to their meaning by the Japanese and Korean languages to represent native words, disregarding pronunciation altogether.

Chinese characters are also known as sinographs, and the Chinese writing system as sinography. Non-Chinese languages which have adopted sinography — and, with the orthography, a large number of loanwords from the Chinese language — are known as Sinoxenic languages, whether or not they still use the characters. The term does not imply any genetic affiliation with Chinese. The major Sinoxenic languages are generally considered to be Japanese, Korean and Vietnamese.