Baron Baltimore
| Barony of Baltimore | |
|---|---|
| Creation date | 1625 |
| Created by | James I |
| Peerage | Peerage of Ireland |
| First holder | Sir George Calvert |
| Last holder | Frederick Calvert, 6th Baron Baltimore |
| Remainder to | Heirs male of the body lawfully begotten |
| Extinction date | 4 September 1771 |
Baron Baltimore, of Baltimore, County Longford, was a title in the Peerage of Ireland. It was created in 1625 and ended in 1771, upon the death of its sixth-generation male heir, aged 40. Holders of the title were usually known as Lord Baltimore for short.