| Election Name: | Chicago mayoral election, 1840 |
| Type: | presidential |
| Ongoing: | no |
| Previous Year: | 1839 |
| Next Year: | 1841 |
| Election Date: | March 3, 1840 |
| Image1: | File:Alexander Loyd (1).jpg |
| Candidate1: | Alexander Loyd |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 582 |
| Percentage1: | 57.91% |
| Candidate2: | Benjamin Wright Raymond |
| Party2: | Whig Party (United States) |
| Popular Vote2: | 423 |
| Percentage2: | 42.09% |
| Mayor | |
| Before Election: | Benjamin Wright Raymond |
| Before Party: | Whig Party (United States) |
| After Election: | Alexander Loyd |
| After Party: | Democratic Party (United States) |
The 1840 Chicago mayoral election saw Democratic nominee Alexander Loyd defeat incumbent Whig Benjamin Wright Raymond by a landslide 15.8 point margin.
With a narrative that local elections such as Chicago's would be a bellwether of the coming 1840 United States presidential election, both parties locally viewed the election as being of great importance.[1] Chicago's mayoral result, ultimately, was no bellwether of the presidential election's party outcome.
The election was held on March 3.[2]