| Election Name: | Baltimore mayoral election, 1959 |
| Flag Image: | Flag of Baltimore, Maryland.svg |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1955 Baltimore mayoral election |
| Previous Year: | 1955 |
| Next Election: | 1963 Baltimore mayoral election |
| Next Year: | 1963 |
| Election Date: | May 5, 1959 |
| Candidate1: | J. Harold Grady |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 155,001 |
| Percentage1: | 68.06% |
| Candidate2: | Theodore McKeldin |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 72,745 |
| Percentage2: | 31.94% |
| Mayor | |
| Before Election: | Thomas D'Alesandro Jr. |
| Before Party: | Democratic Party (United States) |
| After Election: | J. Harold Grady |
| After Party: | Democratic Party (United States) |
The 1959 Baltimore mayoral election saw the election of J. Harold Grady. Grady unseated incumbent mayor Thomas D'Alesandro Jr. in the Democratic primary, and went on to defeat former mayor and governor Theodore McKeldin in the general election.
Primary elections were held March 3.[1] [2]
Incumbent mayor Thomas D'Alesandro was defeated in the primary.[1]
The general election was held May 5.