Lornah Kiplagat (born 1 May 1974) is a Dutch professional long-distance runner. She was born in Kabiemit, Rift Valley Province, Kenya and came to the Netherlands in 1999. She gained Dutch citizenship in 2003 and has competed for the Netherlands since. She used to run not only road events but also in cross country and track and field. Part of a highly successful family of runners, her relatives include Sylvia Kibet, Hilda Kibet and Susan Sirma.