St. Thomas Manor (1741) is a historic home and Catholic church complex located near Port Tobacco, Charles County, Maryland.

[2] Connected to the manor house stands a two-story brick wing that incorporates a former chapel built in 1798, now called St. Ignatius Church.

"[2] In addition, the former corn crib is the "largest structure of its type recorded in Charles County, and one that exhibits many construction features not represented elsewhere.

Notable parishioners are buried there, including Confederate agent Olivia Floyd,[2] La Plata benefactor Adrian Posey, judge Walter M. Digges, and U.S.

[1] Due to its history and scenic waterfront setting, the manor grounds, church and cemetery attract visitors from distant places.

In 1794 it was at St. Thomas Manor that John Carroll was invested in his robes as the first Catholic bishop of the United States of America, after the nation gained independence in the Revolutionary War.