Hamilton Kemp Wright (2 August 1867 – 9 January 1917) was an American physician and pathologist who served as the United States Opium Commissioner.

On March 12, 1911, Wright was quoted in an article in The New York Times: "Of all the nations of the world, the United States consumes most habit-forming drugs per capita.

"[5] In 1910, Wright sought out Vermont representative David Foster, a chairman of the House Committee on Foreign Affairs, to sponsor a bill controlling opiates, cocaine, chloral, and cannabis.

[6] Wright's peers would note that his powers of persuasion were often seen as refractory and impudent, as though he was the specialist entrusted with "the interests of humanity at large".

[6] His reputation notwithstanding, however, Wright would gain favor with the New Yorker Democrat Francis Burton Harrison in revising the failed Foster Bill.

[6] His wife, Elizabeth Washburne (1875-1952), continued Wright's work after his death in 1917 as an assessor to the League of Nations Opium Advisory Committee until 1920s; although, the British Foreign Office called her "incompetent, prejudiced, ignorant, and so constituted temperamentally as to afford a ready means of mischief-making.