No, Franklin D. Roosevelt (FDR) was not a dictator. He was the 32nd president of the United States, serving from 1933 to 1945, and was democratically elected for four terms. While he expanded the power of the federal government significantly through the New Deal and wartime policies, he operated within the constitutional framework and faced regular elections, congressional oversight, and Supreme Court rulings.
However, some critics argue that his long tenure and broad executive actions (such as the internment of Japanese Americans, attempts to pack the Supreme Court, and extensive wartime powers) exhibited authoritarian tendencies. But unlike actual dictators, he did not abolish democratic institutions, suppress opposition violently, or rule without legal constraints. His presidency remained within the structure of the U.S. constitutional system