Delazon Smith (October 5, 1816 – November 19, 1860) was a Democratic Party politician who briefly represented the state of Oregon in the U.S. Senate in 1859.

He served for less than one month (February 14 to March 3), making his term among the shortest on record in the Senate.

According to the obituary in the Chicago Tribune, "The adventurous character of Mr. Smith, and the noted eccentricity of his career, had given him a notoriety greater than is usual to men of a similar grade of ability and attainment.

[4] Smith's career in politics began when he was appointed a special United States commissioner to Quito, Ecuador, serving in this capacity from 1842 to 1845.

[9] Upon Oregon's admission to the Union as the 33rd state, Smith was elected to the Senate, serving from February 14 to March 4, 1859.