Gyllenhammar is a surname. Notable people with the surname include:
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Cecilia Gyllenhammar (born 1961), Swedish author
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Charlotte Gyllenhammar (born 1963), Swedish artist
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Pehr Gyllenhammar (1901–1988), Swedish insurance company executive
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Pehr G. Gyllenhammar (born 1935), Swedish businessman
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Ralf Gyllenhammar (born 1966) Swedish musician
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