Lilli Gjerløw (19 June 1910 – 4 December 1998) was a Norwegian archivist and liturgical historian.
She was born in Nord-Audnedal as a daughter of vicar John Jenssøn Gjerløw (1856–1915) and Agnes Christine Boye.
Her specialty was the unveiling of medieval liturgical texts from the countries around the North Sea.
She also studied the history of the Hebrides from 1952 to 1953 with a NAVF scholarship, and contributed to the encyclopedia Kulturhistorisk leksikon for nordisk middelalder.
In 1982, Gjerløw was awarded the Fridtjof Nansen Prize for Outstanding Research and in 1984 she was elected to the Norwegian Academy of Science and Letters.