Hugh Donaldson O'Bryant (1813–1883) was the first mayor of Portland, Oregon, United States, serving from 1851–1852. He later served as the President of the Oregon Territory’ Council chamber of the legislature, and was a member of Washington Territory’s legislature.

Oregon's Territorial Legislature was a bicameral legislative body created by the United States Congress in 1848 as the legislative branch of the government of the Oregon Territory. The upper chamber Council and lower chamber House of Representatives first met in July 1849; they served as the region's legislative body until Oregon became a state in February 1859, when they were replaced by the bicameral Oregon State Legislature.