See main article: 1872 United States presidential election.
| Election Name: | 1872 United States presidential election in Illinois |
| Country: | Illinois |
| Flag Year: | 1864 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1868 United States presidential election in Illinois |
| Previous Year: | 1868 |
| Next Election: | 1876 United States presidential election in Illinois |
| Next Year: | 1876 |
| Election Date: | November 5, 1872 |
| Image1: | UlyssesGrant.jpg |
| Nominee1: | Ulysses S. Grant |
| Party1: | Republican Party (United States) |
| Home State1: | Illinois |
| Running Mate1: | Henry Wilson |
| Electoral Vote1: | 21 |
| Popular Vote1: | 241,936 |
| Percentage1: | 56.27% |
| Nominee2: | Horace Greeley |
| Party2: | Liberal Republican Party (United States) |
| Colour2: | C154C1 |
| Home State2: | New York |
| Running Mate2: | Benjamin G. Brown |
| Electoral Vote2: | 0 |
| Popular Vote2: | 184,884 |
| Percentage2: | 43.00% |
| Map Size: | 350px |
| President | |
| Before Election: | Ulysses S. Grant |
| Before Party: | Republican Party (United States) |
| After Election: | Ulysses S. Grant |
| After Party: | Republican Party (United States) |
The 1872 United States presidential election in Illinois took place on November 5, 1872. All contemporary 37 states were part of the 1872 United States presidential election. The state voters chose 21 electors to the Electoral College, which selected the president and vice president.
Illinois was won by the Republican nominees, incumbent President Ulysses S. Grant of Illinois and his running mate Senator Henry Wilson of Massachusetts. Grant and Wilson defeated the Liberal Republican and Democratic nominees, former Congressman Horace Greeley of New York and his running mate former Senator and Governor Benjamin Gratz Brown of Missouri.
Grant won his home state by a margin of 13.27%.