Lord Baltimore was the title given several members of the Calvert family who were the proprietors of the colony of Maryland. They include:
- George Calvert, 1st Baron Baltimore
- Cecilius Calvert, 2nd Baron Baltimore
- Charles Calvert, 3rd Baron Baltimore.
- Benedict Leonard Calvert, 4th Baron Baltimore
- Baltimore, Maryland
- Calvert County, Maryland
- Leonardtown, Maryland
- St Leonard, Maryland
- Calvert Cliffs, Maryland