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Matti Akseli Kuusi (25 March 1914 in Helsinki – 16 January 1998 in Helsinki) was a Finnish folklorist, paremiographer and paremiologist. He wrote several books and a number of articles on Finnish folklore. He was the first to have introduced the type system of proverbs similar to the Aarne–Thompson classification system of folklore, the Matti Kuusi international type system of proverbs. With encouragement from Archer Taylor he founded the journal Proverbium: Bulletin d'Information sur les Recherches Parémiologiques, published from 1965 to 1975 by the Society for Finnish Literature, which was later restarted as Proverbium: International Yearbook of Proverb Scholarship. He was a member of the noble family Granfelt, but his father had fennicized his original Swedish surname to express his political sympathies.
During his study period in the 1930s, Matti Kuusi was involved with nationalist political organizations. In the 1950s, he was appointed as the Professor of Folklore in the University of Helsinki, and later as the member of the Academy of Finland, becoming a nationally celebrated intellectual.
He led the effort to produce a collection of "900 Balto-Finnic Proverb Types with Russian, Baltic, German and Scandinavian Parallels", described as one of the "major multilingual proverb dictionaries". Although his personal research specialties were Finnish epic poetry and proverbs, he developed the folklore studies in Finland by encouraging research of urban legends and pop-lore. He took also interest in African folklore.
The international proverb typology developed by Kuusi along with its database of proverbs is available online.
Kuusi's interest in the study of proverbs has been continued by his daughter, Outi Lauhakangas.
Among the scientific achievements of Matti Kuusi, one of the most influential has been the rough chronology he established for the various layers of Finnish epics, based on stylistic analysis, motifs and comparisons with Old Scandinavian and Russian epics.
- Lauhakangas, Outi. 2013. The Matti Kuusi International Database of Proverbs. Oral Tradition 28/2 (2013): 217–222. (Article on his Proverb Type System. Archived 2017-12-01 at the Wayback Machine)
- Lauhakangas, Outi. 2014. Categorization of proverbs, p. 59. Introduction to Paremiology, ed. by Hrisztalina Hrisztova-Gotthardt and Melita Aleksa Varga, pp. 49–67. Berlin: de Gruyter.
- Kuusi, Matti. 1985. Proverbia Septentrionalia. 900 Balto-Finnic Proverb Types with Russian, Baltic, German and Scandinavian Parallels. In cooperation with Marje Joalaid，Elsa Kokare, Arvo Krikmann，Kari Laukkanen, Pentti Leino, Vaina Malk, Ingrid Sarv. FFCommunications No. 236. Helsinki: Suomalainen Tiedeakatemia.
- The Matti Kuusi international type system and database of proverbs.
- "Hietaniemen hautausmaa – merkittäviä vainajia" (PDF). Helsingin seurakuntayhtymä. Retrieved 27 August 2016.
- Kaivola-Bregenhøj, Annikki. "Matti Akseli Kuusi (1914-1998)." Fabula 40.1/2 (1999): 114ff.