Summit Avenue is a street in St. Paul, Minnesota, United States, known for being the longest avenue of Victorian homes in the country, having a number of historic houses, churches, synagogues, and schools. The street starts just west of downtown St. Paul and continues four and a half miles west to the Mississippi River where Saint Paul meets Minneapolis. Other cities have similar streets, such as Prairie Avenue in Chicago, Euclid Avenue in Cleveland, and Fifth Avenue in New York City. Summit Avenue is notable for having preserved its historic character and mix of buildings, as compared to these other examples. Historian Ernest R. Sandeen described Summit Avenue as "the best preserved example of the Victorian monumental residential boulevard."

Saint Paul is the capital of the U.S. state of Minnesota and the county seat of Ramsey County. Situated on high bluffs overlooking a bend in the Mississippi River, Saint Paul is a regional business hub and the center of Minnesota's government. The Minnesota State Capitol and the state government offices all sit on a hill close to the city's downtown district. One of the oldest cities in Minnesota, Saint Paul has several historic neighborhoods and landmarks, such as the Summit Avenue Neighborhood, the James J. Hill House, and the Cathedral of Saint Paul. Like the adjacent city of Minneapolis, Saint Paul is known for its cold, snowy winters and humid summers.