Othniel Looker (October 4, 1757 – July 23, 1845) was a Democratic-Republican politician from Ohio. He served briefly as the fifth Governor of Ohio.
Sources vary on Looker's birth location. He was either born in Morris County, New Jersey or on Long Island, New York. His gravestone goes with the Morris County location. He moved with his mother to Hanover Township, New Jersey when he was two years old after the death of his father. He enlisted with the New Jersey militia in 1776 and served out the remainder of the Revolutionary War as a Private.
In 1779, Looker married Pamela Clark, and circa 1788 Looker moved to Vermont and then to New York, working as a school-teacher.
He served in the New York State Assembly from 1803 to 1804. After receiving a land grant for his war services, Looker moved to Hamilton County, Ohio in 1804, and served in the Ohio House of Representatives from 1807 to 1810. He served in the Ohio State Senate from 1810 to 1817.
While serving as Speaker of the Ohio Senate from 1813 to 1814, Looker was concurrently elevated to the governorship after Governor Return J. Meigs Jr. resigned to become Postmaster General. Looker sought re-election but was badly defeated by the far more well-known Thomas Worthington. He continued to live in Ohio until his wife's death, and later moved to Palestine, Illinois to be with his daughter Rachel Kitchell, and is buried there in Kitchell Cemetery. Looker was the Ohio Presidential elector in 1816 for James Monroe.
The Village Historical Society in Harrison, Ohio, has restored the home of Ohio Governor Othniel Looker. The Othniel Looker House is now open to the public, free of admission, on a few dates during the year, and special tours can be arranged for school groups. The Othniel Looker House is listed in the National Register of Historic Places.