Frederik Herman Henri "Frits" Kortlandt (born 19 June 1946) is a Dutch former professor of descriptive and comparative linguistics at Leiden University in the Netherlands.

He has also studied ways to associate language families into super-groups such as the controversial Indo-Uralic.

[1] Kortlandt, along with George van Driem and a few other colleagues, is one of the proponents of the Leiden school of linguistics, which describes language in terms of a meme or benign parasite.

Kortlandt holds five degrees from the University of Amsterdam: He obtained his PhD under Carl Lodewijk Ebeling with a thesis titled: "Modelling the phoneme : new trends in East European phonemic theory".

[1] Kortlandt has been a member of the Royal Netherlands Academy of Arts and Sciences since 1986[3] and is a 1997 Spinozapremie laureate.