Kalējs (feminine: Kalēja) is a Latvian occupational surname, derived from the Latvian word for "blacksmith". Individuals with the surname include:
Aivars Kalējs (born 1951), Latvian composer, organist and pianist Konrāds Kalējs (1913–2001), a Latvian soldier and a Nazi collaborator Jānis Kalējs (born 1965), a Latvian film director