Bob Daisley (born 13 March 1950) is an Australian bass guitarist and songwriter whose work across rock and heavy metal has made him a highly respected, if sometimes behind-the-scenes, figure in modern popular music. Best known for his collaborations with major acts such as Rainbow, Gary Moore, Ozzy Osbourne, and Uriah Heep, Daisley combined melodic bass playing, solid songwriting instincts, and savvy studio musicianship to shape the sound of many influential albums from the 1970s onward.