Grethe is a given name derived from Margarethe. Notable people with the name include:
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Grethe and Jørgen Ingmann, Danish singers and musicians
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Grethe Fossli (born 1954), Norwegian politician for the Labour Party
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Grethe Grünberg (born 1988), Estonian ice dancer
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Grethe Gynnild Johnsen (born 1959), Norwegian journalist
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Grethe Holmer (1924–2004), Danish actress
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Grethe Ingmann (1938–1990), Danish singer
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Grethe Kausland (1947–2007), Norwegian singer, performer and actress
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Grethe Krogh (1928–2018), Danish organist and professor
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May Grethe Lerum (born 1965), Norwegian novelist
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Grethe Fenger Møller (born 1941), Danish politician
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Grethe Nielsen (1926–), Danish sprinter
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Grethe Philip (1916–2016), Danish politician
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Grethe Rask (1930–1977), Danish physician and surgeon who practiced medicine in what was then known as Zaire
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Grethe Rytter Hasle (born 1920), Norwegian planktologist
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Grethe Sønck (1929–2010), Danish actress and singer
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Grethe Thordahl (1926–2004), Danish stage and film actress
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Grethe Weiser (1903–1970), German actress
