This article attempts to list the oldest extant buildings surviving in the state of Maryland in the United States of America, including the oldest houses in New Jersey and any other surviving structures. Some dates are approximate and based upon dendochronology, architectural studies, and historical records. Sites on the list are generally from the First Period of American architecture or earlier. To be listed here a site must:
| Building | Image | Location | First Built | Use | Notes |
|---|---|---|---|---|---|
| Cross Manor | St. Inigoes, Maryland | 1643 (earliest part) | House | Possibly the oldest house in Maryland. | |
| Third Haven Meeting House | Talbot County, Maryland | 1682 | Religious | Oldest building in Maryland. Oldest Quaker meeting house in the United States. | |
| Spring House | Fort Lincoln Cemetery, Prince George's County, Maryland | 1683 | Spring House | One of the oldest buildings in Maryland[1] | |
| Burrages End | Lothian, Maryland | ca. 1690 (earliest part) | Residence | ||
| Fort Garrison | Stevenson, Maryland | ca. 1695 | Fort | ||
| Holly Hill | Friendship, Maryland | ca. 1698 (earliest part) | Residence | ||
| Morgan Hill Farm | Lusby, Maryland | ca. 1700 | Residence | originally thought to date prior to 1670 | |
| Preston-on-the-Patuxent | Johnstown, Maryland | 1725 | Residence | originally thought to date to 1651 | |
| Christ Church (Ironsides, Maryland) | Nanjemoy, Maryland | 1732 | Religious | Oldest Episcopal church building in Maryland | |
| Maryland State House | Annapolis, Maryland | 1772 | Government | Oldest state house in continuous use in the United States | |
| Pooles Island Light | Pooles Island off Aberdeen Proving Ground | 1825 | Lighthouse | Oldest surviving lighthouse in Maryland | |
| Lloyd Street Synagogue | Baltimore, Maryland | 1840 | Religious | Oldest surviving synagogue building in Maryland, third oldest in U.S. |