Christian Augustus Henry Allhusen (1806–1890) was a Danish -English chemical manufacturer based in the North East of England.
He was born in Kiel. In 1827 in Newcastle, a businessman in the grain trade, he went into partnership with Henry Bolckow. In 1840 he purchased a soap works in Gateshead, and began the manufacture of chemicals. He made a large fortune, and was influential in the region as company director and shareholder.