James O'Hanlon Patterson (June 25, 1857 – October 25, 1911) was a United States representative from South Carolina.

[1] He attended private schools in town and also in Augusta, Georgia.

[1] Later, he studied law, was admitted to the bar in 1886, and commenced practice in Barnwell, South Carolina.

[1] Patterson was a probate judge of Barnwell County, South Carolina 1888–1892[1] and a member of the South Carolina House of Representatives 1899–1904.

After leaving Congress, he resumed the practice of his profession in Barnwell, South Carolina where he died on October 25, 1911.