Caspar Voght, later Caspar Reichsfreiherr von Voght, was a German merchant and social reformer from Hamburg. Together with his business partner and friend Georg Heinrich Sieveking he led one of the largest trading firms in Hamburg during the second half of the 18th Century. On numerous trade trips, he completely crossed the European continent. One of his greatest achievements was reforming the welfare system of Hamburg. From 1785 he dedicated himself to strengthening agricultural and horticultural projects and built a model agricultural community in Flottbek, close to the gates of Hamburg.