McGregor, located on SR 547 in Port Gibson, Mississippi, USA, is a country house built in 1835.

The one-and-a-half story house was designed and/or built by the planter and judge Peter Aaron Van Dorn (1773-1837) for one of his daughters, likely as a wedding present.

He settled in Port Gibson about 1811, setting up a law practice, marrying and becoming involved in local civic affairs.

After Mississippi was admitted as a state, Van Dorn was appointed a judge on the Orphan's Court.

About 1830, he had built his own fine residence, known as Van Dorn House, on a hill in Port Gibson.