In the United States:

• Tidewater is a name used to refer to an area in Virginia, in the region around Hampton Roads, Newport News, Norfolk, and Virginia Beach: see Tidewater region of Virginia. Similarly, the name "Tidewater" is also used to refer to the distinct accent used by many residents of the region.

• The term is also sometimes applied to the entire South Atlantic coastal region generally, and occasionally extended to include all coastal areas of the Southern states (including those with coasts on the Gulf of Mexico); when used in the former sense, it is contrasted with the Piedmont and/or Appalachia, and when used in the latter sense it is contrasted with the "Inland" or "Highland" South, or, as it is sometimes referred to, the "upcountry".

• Tidewater is a place in Oregon: see Tidewater, Oregon

• Tidewater Accent is a American English accent is spoken in the coastal Eastern Seaboard Region from southern New Jersey to the Outer Banks of North Carolina. This accent was 'inherited' from the early English settlers.

• Tidewater Inc. owns and operates the world's largest fleet of ships serving the international offshore energy industry. ^*

• Tidewater Petroleum was a former name of Getty Oil, now owned by ChevronTexaco.
• Amtrak's former Tidewater passenger train