Hugh Donaldson O'Bryant (1813–1883) was an American politician who served as the first mayor of Portland, Oregon, from 1851 to 1852.

Hugh O’Bryant was born on December 5, 1813 in Franklin County, Georgia, to Duncan O'Bryant and Martha Whitehead.

O'Bryant's father refused and moved his family to Arkansas where he continued his missionary work to the Cherokees until his death in 1834.

[5] In Portland, O'Bryant used his own money to fund the city's first library, located in one room of a business block.

Robert Thompson, Shubrick Norris, Thomas G. Robinson, George A. Barnes, and Loren B. Hastings were all elected councilors.

[9][10] After his term, he performed justice of the peace duties for a short time and provided carpentry services for many new immigrants.

In 1855, O'Bryant began serving in the Oregon Territorial Council, the upper house of the legislature, as a Democrat.