Clermont Harbor is an unincorporated community on the western end of Hancock County on the Gulf Coast of Mississippi. It is part of the Gulfport–Biloxi, Mississippi Metropolitan Statistical Area.

The US Post Office considers the area an extension of Bay St. Louis although Waveland lies between them. It is approximately seven blocks wide and about five blocks inland (1/2 mile) to the CSX Transportation line. Clermont Harbor was completely destroyed by Hurricane Katrina.

Before and since Katrina, Clermont Harbor has been in the news because developers wanted to build high-rise condominiums on the beach in the area. The Hancock County Board of Supervisors had already approved the Silver Slipper Casino nearby at Bayou Caddy and numerous condominiums towers as tall as 36 stories very close to or in front of Clermont Harbor. The Silver Slipper Casino opened on November 9, 2006 as the first newly built, land-based casino in the Mississippi Gulf Coast region. However, the proposed condominium towers appear to be on hold indefinitely.

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