The Putnam House is a historic building in the Harmar neighborhood of Marietta, Washington County, Ohio, United States, on the National Register of Historic Places.

The building was finished in 1805 consisting of 16” sandstone blocks quarried locally on Harmer Hill.

In 1807 it co-housed the first banking corporation in the Northwest Territory and Ohio.

[1] Marietta's leading abolitionist, David Putnam, Jr. was born in this house in 1808.

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