Ulysses Simpson Grant IV (May 23, 1893 – March 11, 1977) was an American geologist and paleontologist known for his work on the fossil mollusks of the California Pacific Coast. He was the youngest son of Ulysses S. Grant Jr., and a grandson of President Ulysses S. Grant and Senator Jerome B. Chaffee. He was born at his father's farm, Merryweather Farm, in Salem Center, Westchester County, New York. Shortly after his birth, the family moved to San Diego, California.