Melba is a city in Canyon County, Idaho, United States. The population was 439 at the 2000 census. It is part of the Boise City–Nampa, Idaho Metropolitan Statistical Area.
Melba is located at 43°22′25″N 116°31′45″W / 43.37361°N 116.52917°W / 43.37361; -116.52917 (43.373487, -116.529194).
According to the United States Census Bureau, the city has a total area of 0.3 square miles (0.8 km²), all of it land.