Brown Island, Brown's Island, or Browns Island may refer to:
Brown Island or Brown Atoll, the Japanese name for Enewetak Atoll
Brown Island (Antarctica)
Browns Island (New Zealand), a small volcano off the coast of Auckland
Browns Island (California), a 595-acre (2.41 km2) wetland in the San Jaoquin-Sacramento Delta
Brown Island (Massachusetts)
Brown Island (New York), an island on the West Canada Creek
Brown Island (North Carolina), a barrier island located near Marine Corps Base Camp Lejeune
Brown's Island, Virginia
Brown Island (Washington)
Browns Island (Washington), and island in the Columbia River, west of Wishram, Washington
Browns Island (West Virginia), an island in the Ohio River
Tahoramaurea Island / Browns Island, an island in the Wellington region of New Zealand