Stephen Wallace Dorsey (February 28, 1842 – March 20, 1916) was a Republican politician who represented Arkansas in the United States Senate from 1873 to 1879, during the Reconstruction era.

He was born in Benson in Rutland County, Vermont, and subsequently moved to Ohio and settled in Oberlin, where he attended public schools.

Less than a year prior to the outbreak of the Brooks-Baxter War, a conflict over the governorship of Arkansas, Dorsey initially supported Governor Elisha Baxter.

During this tumultuous period, Congressman Jasper D. Ward from Illinois visited Arkansas to evaluate the situation on behalf of the Poland Committee.

The Democratic Party gained complete control of the state assembly with the adoption of the new 1874 Arkansas Constitution and the election of Augustus Garland, leading to Dorsey not seeking reelection in 1879.