The Rock Island Islanders was the primary name of the minor league baseball teams based in Rock Island, Illinois, one of the Quad Cities, between 1892 and 1937. Rock Island teams played as members of the Illinois–Iowa League (1892), Western Association (1894), Eastern Iowa League (1895), Western Association (1898–1899), Illinois–Indiana–Iowa League (1901–1911), Central Association (1914), Illinois–Indiana–Iowa League, Mississippi Valley League (1922–1933) and Western League (1934–1937).

Rock Island is a city in and the county seat of Rock Island County, Illinois, United States. The population was 37,108 at the 2020 census. Located at the confluence of the Rock and Mississippi rivers, it is one of the Quad Cities along with neighboring Moline and East Moline in Illinois and the cities of Davenport and Bettendorf in Iowa. The Quad Cities had a population of 384,324 in 2020. The city is home to Rock Island Arsenal, the largest government-owned weapons manufacturing arsenal in the US, which employs 6,000 people. The original Rock Island, from which the city name is derived, is now called Arsenal Island.