Both immigrant Poles and Americans of Polish heritage live in Chicago, Illinois. They are a part of worldwide Polonia, the Polish term for the Polish Diaspora outside of Poland. Poles in Chicago have contributed to the economic, social and cultural well-being of Chicago from its very beginning. Poles have been a part of the history of Chicago since 1837, when Captain Joseph Napieralski, along with other veterans of the November Uprising first set foot there. As of the 2000 U.S. census, Poles in Chicago were the largest European American ethnic group in the city, making up 7.3% of the total population. However, according to the 2006–2008 American Community Survey, German Americans and Irish Americans each had slightly surpassed Polish Americans as the largest European American ethnic groups in Chicago. German Americans made up 7.3% of the population, and numbered at 199,789; Irish Americans also made up 7.3% of the population, and numbered at 199,294. Polish Americans now made up 6.7% of Chicago's population, and numbered at 182,064. Polish is the fourth most widely spoken language in Chicago behind English, Spanish, and Mandarin.

Polish Americans are Americans who either have total or partial Polish ancestry, or are citizens of the Republic of Poland. There are an estimated 8.81 million self-identified Polish Americans, representing about 2.67% of the U.S. population, according to the 2021 American Community Survey conducted by the U.S. Census Bureau.