Grass Valley may refer to:

• Grass Valley, Western Australia, a small town in the Avon Valley
• Grass Valley, California, a city in Nevada County
• Grass Valley, Oakland, California, a neighborhood
• Grass Valley, Nevada, census-designated place in Pershing County
• Grass Valley (Pershing County), a valley in Nevada
• Grass Valley, Oregon, a city in Sherman County
• Grass Valley (Utah), a valley in Piute County
• Grass Valley (company), a television and film technology company
• Grass valley, a meadow within a small forested drainage basin such as a headwater

A grass valley (also vega and valle) is a meadow located within a forested and relatively small drainage basin such as a headwater. Grass valleys are common in North America, where they are created and maintained principally by the work of beavers. Rarely, they are associated with cienegas.