Portland Manor is a historic home at Lothian, Anne Arundel County, Maryland, United States.

[6] Although subdivided numerous times since then, the 3.8-acre remnant remains surrounded on three sides by unspoiled farmland and has been carefully maintained and restored over a fifteen-year period, beginning in 1997, by an owner/architect.

[citation needed] In 2001, Portland Manor was recipient of the Anne Arundel County Orlando Ridout Prize for historic preservation.

The second floor, accessed by the original central staircase and two secondary stairs, includes four large bedrooms, three full baths and a laundry/storage room (equipped with a front-loading washer and dryer and an upright freezer).

Future archeological investigations may confirm suspected locations for an icehouse and various outbuildings and may add to the various artifacts found by the current owners that are included in a historic display at the second floor hallway.