Ronald J. Gidwitz (born March 28, 1945) is an American businessman, diplomat, and political candidate who served as United States Ambassador to Belgium, while also serving as acting United States Ambassador to the European Union. Gidwitz is the son of prominent Chicago businessman Gerald Gidwitz. Gidwtiz served as president and CEO of Helene Curtis Industries, which was sold to Unilever in 1996. In 1998, Gidwitz co-founded the private equity firm GCG Partners, which he served as a partner at.