Isaac Daniel Roosevelt (September 29, 1790 — December 24, 1863) was an Americanbusinessman, and the paternal grandfather of U.S. President Franklin D. Roosevelt.

Biography
He was born in Hyde Park, New York to Jacobus Roosevelt (1760–1847) and Catherine Welles (1762–1829). In 1825 he married Mary Rebecca Aspinwall, daughter of John Aspinwall and Susan Howland. They had two children, James Roosevelt and John Aspinwall Roosevelt. James was the father of Rosey and President FDR. John Aspinwall was the father of tennis players Grace and Ellen.

Death
Isaac D. Roosevelt died on December 24, 1863, at the age of 73. He was buried in the churchyard of St. James Episcopal Church in Hyde Park, New York.^[1]

Legacy
His house, the center of his Rosedale estate, still stands on Riverview Circle in Hyde Park. It was listed on the National Register of Historic Places in 1993, along with a cottage and boathouse on the Hudson River nearby.