Leifur is a given name. Notable people with the name include:
Leifur Ásgeirsson (1903–1990), Icelandic mathematician Leifur Garðarsson (born 1968), Icelandic basketball referee, athlete and football manager Leifur James, English record producer and composer Leifur Magnusson (1882–1960), Icelandic American economist
See also Leifur Eriksson International Airport, the largest airport in Iceland,