Belle Field, also known as Timonium Mansion, was a historic home located at Timonium, Baltimore County, Maryland, United States. It was a large, two story structure, half brick and the other half stone, and sheathed in stucco. The brick section dated to about 1780. The house was built by Archibald Buchanan, a Baltimore merchant. ()

Belle Field was listed on the National Register of Historic Places in 1975. It was demolished in 1977, and subsequently delisted from the register in 1986.

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