Night & Day: Big Band is the eighteenth studio album by the American band Chicago, and twenty-second overall, released in 1995. It is a departure from Top 40 material for a more thematic project, with a focus on classic big band, jazz, and swing music.

Chicago is an American rock band formed in Chicago in 1967. The group began calling themselves the Chicago Transit Authority in 1968, then shortened the name in 1969. Self-described as a "rock and roll band with horns," their songs often also combine elements of classical music, jazz, R&B, and pop music.