Tidewater may refer to:
- Tidewater (geographic term), a geographic area of southeast Virginia and northeast North Carolina
- Tidewater glacier, a classification of glacier
- Tidewater (marine services), a company providing marine services to the offshore petroleum industry
- Tidewater (Amtrak), a former passenger train through the American South
- Tidewater, Oregon, a settlement
- Tidewater Petroleum, a former name of Getty Oil
- Tidewater architecture, a style of architecture found mostly in coastal areas of the Southern United States
- Tidelands, an area affected by the tide
- Tidewater, Florida, a place in Florida