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.

After he received his doctorate, Grant worked at the Natural History Museum of Los Angeles County as the curator of invertebrate paleontology.

Grant died at St. John's Hospital in Santa Monica, California, from lung failure caused by leukemia.

Grant is buried at Greenwood Memorial Park (San Diego) alongside his father.

In 1950, he married Frances Dean, who was born circa 1911 in Kentucky and died December 8, 1991, in Honolulu, Hawaii.