Blue is the fourth studio album by Canadian singer-songwriter Joni Mitchell, released on June 22, 1971, by Reprise Records.

Written and produced entirely by Mitchell, Blue explores various facets of relationships from infatuation on "A Case of You" to insecurity on "This Flight Tonight".

The album is generally regarded by music critics as one of the best albums of all time. In 2020, Blue was rated the 3rd greatest album of all time in Rolling Stones “500 Greatest Albums of All Time”.