The Elgin Road Races were a series of automobile races that took place on closed public roads in Elgin, Illinois between 1910 and 1920. The races were suspended during World War I and resumed in 1919 and 1920. The Elgin National Trophy became one of the most prestigious American automobile races of the early 20th Century and contributed significantly to the development of the modern automobile.

Elgin is a city in Cook and Kane counties in the U.S. state of Illinois. It is located 35 mi (56 km) northwest of Chicago along the Fox River. As of the 2020 census, the city had a population of 114,797, making it the sixth-most populous city in the state.