The Motif-Index of Folk-Literature is a six volume catalogue of motifs, granular elements of folklore, composed by American folklorist Stith Thompson (1932–1936, revised and expanded 1955–1958). Often referred to as Thompson's motif-index, the catalogue has been extensively used in folklore studies, where folklorists commonly use it in tandem with the Aarne–Thompson–Uther Index, an index used for folktale type analysis.