Charles Q. Clapp Block | |
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| Location | Congress Sq., Portland, Maine |
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| Coordinates | 43°39′15″N 70°15′47″W / 43.65417°N 70.26306°W |
| Area | 0.5 acres (0.20 ha) |
| Built | 1826 |
| Architect | Clapp, Charles Quincy; Stevens, John Calvin |
| Architectural style | Federal |
| NRHP reference No. | 78000168[1] |
| Added to NRHP | January 31, 1978 |
The Charles Q. Clapp Block (also known as the Hay Building) is a historic commercial building in Congress Square in downtown Portland, Maine. It occupies a prominent triangular site at the intersections of Congress, High and Free Streets. Built in 1826, to a design by prominent local architect and merchant Charles Q. Clapp, it is one of the oldest commercial buildings in Portland.