Robert "Bob" Daisley (born February 13, 1950) is from Australia. He is a legendary bass guitar playing musician who has performed in genres from Rock and Roll to the Blues. He revolutionised bass playing, using the "sweep picking" technique to play three octave arpeggios in lightning-fast succession.

Daisley was bassist and lyricist for Ozzy Osbourne on his most successful solo releases of the 1980's. After a lawsuit brought by Daisley for unpaid royalties, his bass tracks were removed from later remasters of Blizzard of Ozz and Diary of a Madman albums in 2002. The tracks were re-recorded by Rob Trujillo of Suicidal Tendencies and Metallica fame.

In 1983 however, he went back to working with Osbourne, with whom he would continue to write and record throughout the 1980s and into the '90s, playing on and writing all the lyrics for Bark at the Moon, No Rest For The Wicked and The Ultimate Sin (for which he was also originally uncredited) in 1986. Daisley maintained his working relationship with Osbourne up until 1991's No More Tears album which featured his bass playing despite the presence of Mike Inez (who later joined Alice in Chains) in the album's promotional videos.

During his on-again, off-again relationship with Osbourne, Daisley also recorded many albums with Gary Moore and toured extensively with him.

In 1987 he was approached by producer Jeff Glixman to play on the Black Sabbath album The Eternal Idol as the band's actual bass player Dave Spitz "wasn't working out". However, Spitz was still credited on the final release along with Daisley. Daisley was offered the bassist spot in Black Sabbath but turned it down due to his commitment to Moore. He continued to work with Gary Moore until recently.

Since the beginning of the '90s, Daisley has contributed to a wealth of recordings as bassist, lyricist and producer, including albums by Yngwie Malmsteen, Takara, Bill Ward and Jeff Watson of Night Ranger. Shortly after, Daisley and Watson teamed up once again and formed Mother's Army along with vocalist Joe Lynn Turner and drummer Carmine Appice. In 2003, following his second and unsuccessful suit against Ozzy Osbourne, he teamed up with Lee Kerslake, Steve Morse of Deep Purple and Australian rock singer Jimmy Barnes to record an album under the name Living Loud. Six of the album's eleven tracks were covers from Blizzard of Ozz and Diary of a Madman. Don Airey also played keyboards on the Living Loud album. On 7 February 2003 Daisley recorded a live show at The Basement in Sydney with Australian blues band The Hoochie Coochie Men, for a live DVD and CD release. Also featured were former Deep Purple organist Jon Lord and Jimmy Barnes. In 2007 The Hoochie Coochie Men released the studio album 'Danger: White Men Dancing' also featuring Jon Lord.

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