Discovery Bay is a residential development in Hong Kong, on Lantau Island. Discovery Bay may also refer to:

• Discovery Bay (Australia), a bay straddling the border between South Australia and Victoria in Australia
• Discovery Bay Coastal Park, a protected area in Victoria (Australia)
• Discovery Bay Marine National Park, a marine protected area in Victoria (Australia)

• Discovery Bay, California, community
• Discovery Bay (Washington), bay
• Discovery Bay, Washington, community

• Discovery Bay (Antarctica), a bay in the South Shetland Islands
• Discovery Bay, Jamaica, a town in Jamaica
• A planned (but never built) land at Disneyland

• Disco Bay