| Election Name: | 2021 Atlantic City mayoral election |
| Flag Image: | Flag of Atlantic City, New Jersey.gif |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 2017 Atlantic City mayoral election |
| Previous Year: | 2017 |
| Election Date: | November 2, 2021 |
| Next Election: | 2025 Atlantic City mayoral election |
| Next Year: | 2025 |
| Nominee1: | Marty Small Sr. |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 3,390 |
| Percentage1: | 54.2% |
| Mayor | |
| Before Election: | Marty Small Sr. |
| Before Party: | Democratic Party (United States) |
| After Election: | Marty Small Sr. |
| After Party: | Democratic Party (United States) |
| Nominee2: | Tom Forkin |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 1,305 |
| Percentage2: | 20.8 |
| Nominee3: | Daud Panah |
| Popular Vote3: | 380 |
| Percentage3: | 6.08% |
| Nominee4: | Steven Layman |
| Popular Vote4: | 578 |
| Percentage4: | 9.25% |
| Nominee5: | Moisse Delgado |
| Popular Vote5: | 393 |
| Percentage5: | 6.29% |
| Nominee6: | Jimmy Whitehead |
| Popular Vote6: | 202 |
| Percentage6: | 3.23% |
The 2021 Atlantic City mayoral election was held on November 2, 2021, to elect the Mayor of Atlantic City, New Jersey. Primary elections were held on June 7. Incumbent Democrat Marty Small Sr., who was running for a full term after being elected to the mayor position by City Council following Frank Gilliam's resignation, won re-election to his first full term against Republican opponent Tom Forkin and several other opponents running third-party.[1]
Following the arrest of mayor Frank Gilliam in 2019, then-Councilman Marty Small became the acting mayor of Atlantic City in a 8–0 vote by the City Council.[2]
The 2021 election was held to determine the next mayor of Atlantic City. Small ran against a largely divided opposition and won a majority of the 6,248 ballots cast in the election. Tom Forkin won the 6th Ward, which includes the Lower Chelsea and Chelsea Heights neighborhoods.