My Lady's Manor is a national historic district at Monkton, Baltimore County and Jarrettsville, Harford County, Maryland, United States.

It is a rural or agricultural area, with one village, Monkton.

Monkton first developed around a water-powered grist mill and later became a station on the Northern Central Railway.

Over 60 principal structures, plus numerous important outbuildings associated with them, are included in the district.

[2] It was added to the National Register of Historic Places in 1978.