Robert John Daisley (born 13 February 1950) is an Australian musician and songwriter. A bassist, he is perhaps best known for his intermittent relationship with vocalist Ozzy Osbourne, for whom he contributed bass guitar, co-production and songwriting throughout the 1980s. Daisley has also worked with prominent rock acts including Black Sabbath, Rainbow, Gary Moore, Chicken Shack and Uriah Heep, among others.
