20th Century Masters – The Millennium Collection: The Best of Rainbow is a compilation album released by Rainbow. Released on 3 October 2000. The tracks were recorded between 1975–1983, before Rainbow disbanded in 1984.

Vocals: Ronnie James Dio (1-6), Graham Bonnet (7), Joe Lynn Turner (8-11)
Guitar: Ritchie Blackmore (1-11) />Bass: Craig Gruber (1-2), Jimmy Bain (3-4), Bob Daisley (5-6), Roger Glover (7-11)
Drums: Gary Driscoll (1-2), Cozy Powell (3-7), Bobby Rondinelli (8-10), Chuck Burgi (11)
Keyboards: Micky Lee Soule (1-2), Tony Carey (3-4), David Stone (5-6), Don Airey (7-8), David Rosenthal (9-11)