Aleš Klégr (born 27 November 1951) is a Czech linguist, professor of English language at Charles University in Prague.

[1] As a student of English (along with psychology) at Charles University in Prague, he was a pupil of Prague school linguists Bohumil Trnka and Ivan Poldauf.

Having started his academic career as researcher with the Encyclopaedic Institute, Czech Academy of Sciences, and instructor at several university language centres, he joined the Department of English and American Studies (1990–2008) and later the Department of English Language and ELT Methodology (2008- ) at Faculty of Arts, Charles University in Prague, where he found formative inspiration in a long-term cooperation with Libuše Dušková, Bohumil Trnka's prominent successor.

A reader (1996) and professor (2004) of English language, Aleš Klégr has studied systemic and textual relations between English and Czech on the grammatical and lexical level.

He is the author of The Noun in Translation (1996); English Complex Prepositions of the Type in spite of and Analogous Sequences Praha 2002), Česko-anglický slovník spojení: podstatné jméno a sloveso (2005) and Tezaurus jazyka českého (2007).