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.
He married Dorthea "Bitten" Emma Clausen (née Dorthea Emma Andkjær Hinrichsen; 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)