| Official Name: | Antietam, Maryland |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Maryland#USA |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Maryland |
| Subdivision Type2: | County |
| Subdivision Name2: | Washington |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.40 |
| Area Land Km2: | 0.40 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 0.15 |
| Area Land Sq Mi: | 0.15 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 98 |
| Population Density Km2: | 246.59 |
| Population Density Sq Mi: | 640.52 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 308 |
| Coordinates: | 39.4161°N -77.7422°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 21782[2] |
| Area Codes: | 301, 240 |
| Blank Name: | FIPS code |
| Blank Info: | 24-01750 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2583571 |
Antietam is an unincorporated community and census-designated place in Washington County, Maryland, United States. Its population was 89 as of the 2010 census.[3] It is the site of Antietam Iron Furnace Site and Antietam Village, added to the National Register of Historic Places in 1975.
According to the U.S. Census Bureau, the community has an area of, all land.