Laurents Hallager (12 November 1777 – 2 February 1825) was a Norwegian physician and lexicographer.Hallager had a Danish background but he grew up in Bergen.
He studied in Copenhagen and received his medical degree in 1804.
As a student, he compiled a glossary of approximately 6,000 Norwegian words and expressions, titled Norsk Ordsamling (Norwegian Vocabulary).
Today this is considered the first Norwegian dialect dictionary.