| Election Name: | October 1838 Maryland gubernatorial election |
| Country: | Maryland |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | January 1838 Maryland gubernatorial election |
| Previous Year: | Jan. 1838 |
| Next Election: | 1841 Maryland gubernatorial election |
| Next Year: | 1841 |
| Election Date: | 3 October 1838 |
| Nominee1: | William Grason |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 27,722 |
| Percentage1: | 50.28% |
| Nominee2: | John N. Steele |
| Party2: | Whig Party (United States) |
| Popular Vote2: | 27,409 |
| Percentage2: | 49.72% |
| Governor | |
| Before Election: | Thomas Veazey |
| Before Party: | Whig Party (United States) |
| After Election: | William Grason |
| After Party: | Democratic Party (United States) |
The October 1838 Maryland gubernatorial election was held on 3 October 1838 in order to elect the Governor of Maryland. Following an 1838 constitutional amendment, Governors would be elected through popular vote instead of by the Maryland General Assembly. Democratic nominee and former member of the Maryland House of Delegates William Grason narrowly defeated Whig nominee and former member of the United States House of Representatives from Maryland's 1st district John N. Steele.[1]
On election day, 3 October 1838, Democratic nominee William Grason won the election by a margin of 313 votes against his opponent Whig nominee John N. Steele, thereby gaining Democratic control over the office of governor. Grason was sworn in as the 25th Governor of Maryland on 7 January 1839.[2]