The Ian Gillan Band were an English progressive jazz-rock band formed by singer Ian Gillan of Deep Purple in 1975. Their sound is a departure from the heavy metal of Deep Purple by featuring a progressive jazz fusion sound, more similar to bands such as Brand X.

Ian Gillan is an English singer who is best known as the lead singer and lyricist for the rock band Deep Purple. He is known for his powerful and wide-ranging singing voice.