Wade–Giles is a romanization system for Mandarin Chinese. It developed from a system produced by Thomas Francis Wade, during the mid-19th century, and was given completed form with Herbert A. Giles's Chinese–English Dictionary of 1892.

Romanization of Chinese is the use of the Latin alphabet to transliterate Chinese. Chinese uses a logographic script and its characters do not represent phonemes directly. There have been many systems using Roman characters to represent Chinese throughout history. Linguist Daniel Kane wrote, "It used to be said that sinologists had to be like musicians, who might compose in one key and readily transcribe into other keys." The dominant international standard for Standard Mandarin since about 1982 has been Hanyu Pinyin, invented by a group of Chinese linguists, including Zhou Youguang, in the 1950s. Other well-known systems include Wade–Giles and Yale romanization.