2016 United States presidential election in Illinois

The 2016 United States presidential election in Illinois was held on Tuesday, November 8, 2016, as part of the 2016 United States presidential election in which all 50 states plus the District of Columbia participated. Illinois voters chose electors to represent them in the Electoral College via a popular vote, pitting the Republican Party's nominee, businessman Donald Trump, and running mate Indiana Governor Mike Pence against Democratic Party nominee, former Secretary of State Hillary Clinton, and her running mate Virginia Senator Tim Kaine. Illinois had 20 votes in the Electoral College.

Illinois was won by Clinton, who garnered 55.83% of the votes cast against Trump's 38.76%, thus winning the state by a margin of 17.07%. Prior to the election, news organizations accurately predicted that the state would be carried by Clinton, who was born in Illinois. Clinton won by a slightly wider margin than Barack Obama in 2012, making it one of eleven states (and the District of Columbia) in which she outperformed Obama's 2012 margin; however, due to an increase in third-party voting, her overall percentage of the vote was lower than Obama's in both his runs. Trump flipped eleven counties red, although all of them have small populations; the most populous of them, Whiteside County, has under 60,000 residents. He also became the first Republican ever to win the White House without carrying DeKalb, DuPage, Kane, Lake, Will, or Winnebago Counties.