Henry Semon (November 3, 1884 – October 9, 1958), also known as Hank Semon, was a potato farmer and politician from Oregon.
He served twelve terms in the Oregon House of Representatives, making him one of the longest serving members of that body.
A conservative Democrat from a rural district, Semon was known for his ability to work with Republicans in the state legislature.
As a result, he served as chairman of the powerful ways and means committee for nine terms, serving in that position under both Democratic and Republican majorities.
He was also an innovative farmer, who brought a new potato variety into common use in south central Oregon.