Guillaume Jacques (Chinese: 向柏霖; pinyin: Xiàng Bólín, born 1979[1]) is a French linguist who specializes in the study of Sino-Tibetan languages: Old Chinese, Tangut, Tibetan, Gyalrongic and Kiranti languages.

His case studies in historical phonology are set in the framework of panchronic phonology, aiming to formulate generalizations about sound change that are independent of any particular language or language group.

Jacques is one of the main contributors to the Pangloss Collection, an open archive of endangered-language data.

He taught at Paris Descartes University for four years before taking up a permanent research position at the Centre de recherches linguistiques sur l'Asie orientale (CRLAO).

[4] Guillaume Jacques is one of the Editors of the linguistics journal Cahiers de Linguistique Asie Orientale.