Ellis Wainwright (August 3, 1850 – November 6, 1924) was an American capitalist, brewer, art collector and socialite from St. Louis, Missouri. He was President of the St. Louis Brewing Company and Director of the St. Louis and Suburban Company. He is best known for the Wainwright Building in Downtown St. Louis which was one of the first skyscrapers in the world and one of the most important office buildings of the period.