Mads Clausen (21 October 1905 – 27 August 1966) born in Elsmark, parish of Havnbjerg, municipality of Nordborg in Denmark, was a Danish industrialist and founder of Danfoss in 1933. He died in transit from Elsmark to Sønderborg.^[1][2]

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He married Dorthea (Bitten) Emma Clausen (1912–2016) in 1939. The couple had five children:

• Karin Clausen (b. 1940)
• Bente Clausen (b. 1942)
• Jørgen Mads Clausen (b. 1948), chairman of Danfoss's board of directors
• Peter Johan Mads Clausen (b. 1949)
• Henrik Mads Clausen (b. 1953)

• Universe (Danish amusement park), a Danish science park established by Danfoss