"Jehan de Mandeville", translated as "Sir John Mandeville", is the name claimed by the compiler of a singular book of supposed travels, written in Anglo-Norman French, and published between 1357 and 1371.

By aid of translations into many other languages, the work acquired extraordinary popularity. Despite the extremely unreliable and often fantastical nature of the travels it describes, it was used as a work of reference—Christopher Columbus, for example, was heavily influenced by both this work and Marco Polo's earlier Travels.

John de Mandeville crossed the sea in 1322; had traversed by way of Turkey (Asia Minor and Cilicia), Tartary, Persia, Syria, Arabia, Egypt upper and lower, Libya, the great part of Ethiopia, Chaldea, Amazonia, India the Less, the Greater and the Middle, and many countries about India; had often been to Jerusalem, and had written in Romance languages as more generally understood than Latin.