Walnut Grove is a historic plantation home located in Clarksville, Howard County, Maryland.

The Walnut Grove plantation was built on land patented by Thomas Browne as Browne's Chance and Dorsey's Friendship.

[1] Revolutionary war patriot Col Gassaway Watkins built the stone manor house in 1780 with an onsite cemetery.

The property was also owned by racetrack & farm owner John Gill and son Barry Gill [2][3] In 1979 the property was entered into a historic preservation easement, with the intent to develop after a 25-year review.

In 2001, the owners of Walnut Grove proposed developing 202 acres of the site near Sheppard Lane to develop 101 housing units with Goodier Builders.