Nelson "Cadillac" Williams (September 26, 1917, Montgomery, Alabama – 1973, Voorburg, the Netherlands) was an American jazz trumpeter. Williams began playing piano at age 13 and settled on trumpet soon afterwards; he may have played with blues pianist/singer Cow Cow Davenport while still a teenager. In the 1930s, he played in the territory bands Trianon Crackerjacks and Brown Skin Models, and acted as musical director for the . Around 1940, he left Alabama for Philadelphia, where he played with Tiny Bradshaw's band before joining the U.S. Army during World War II.