Norman or Norman French is a Romance language which can be classified as a langue d'oïl, which also includes French, Picard and Walloon. The name "Norman French" is sometimes used to describe not only the Norman language, but also the administrative languages of Anglo-Norman and Law French used in England. For the most part, the written forms of Norman and modern French are mutually intelligible. This intelligibility was largely caused by the Norman language's planned adaptation to French orthography.

Guernésiais, also known as Dgèrnésiais, Guernsey French, and Guernsey Norman French, is the variety of the Norman language spoken in Guernsey. It is sometimes known on the island simply as "patois". As one of the langues d'oïl, it has its roots in Latin, but has had strong influence from both Old Norse and English at different points in its history.