Oliver Horton Lamoreux or Lamoreaux (April 22, 1824 – May 18, 1891) was an American lawyer, politician, and Wisconsin pioneer.
He was a member of the Wisconsin State Assembly, representing Portage County during the 1872 session.
He received a common school education and became a farmer; he came to Wisconsin in 1851 and settled at Stockton in Portage County.
Oliver was appointed to the standing committee on town and city organization.
[4] Neither brother was a candidate for re-election in 1872; Oliver was succeeded by Republican David R. Clements.