Best of Ozz is a compilation album by Ozzy Osbourne, released in 1989. This album was released without his consent and is a record company greatest hits rather than an artist approved greatest hits.

This compilation doesn't have any songs for the previous album No Rest for the Wicked.

A greatest hits album, sometimes called a best of album or a catalog album, is a compilation of songs by a particular artist or band. Most often the track list contains previously released recordings with a high degree of notability. However to increase the appeal, especially to people who already own the original release, it is common to include remixes and/or alternate takes of popular songs; even new material (previously unreleased). At times a greatest hits compilation is the original release for songs that have themselves been released as a single and charted successfully.

Madonna's The Immaculate Collection is the best selling greatest hits compilation by a solo artist; all of the songs on it are presented in different versions than the original hit versions. The Eagles' Their Greatest Hits (1971–1975) is the best selling greatest hits compilation by a group and also one of the ten best selling albums in history. Johnny Mathis's Johnny's Greatest Hits (1958) is generally considered the first greatest hits album. It was popular, remaining on the Billboard Top Albums Chart for a then record-breaking 490 continuous weeks. Greatest hits albums are typically produced after an artist has had enough successful songs to fill out an album release. Some artists, such as Michael Jackson, The Beatles, Kenny Rogers, Aerosmith, Kiss, U2, Los Tigres del Norte, Queen and Billy Joel, have released multiple greatest hits albums through their careers. Some greatest hits albums are released only at the end of the artist or group's career. Creed released a greatest hits album after they disbanded.

John Michael "Ozzy" Osbourne (born 3 December 1948) is an English heavy metal vocalist and songwriter, whose musical career has spanned over 40 years. Osbourne rose to prominence as lead singer of the pioneering English band Black Sabbath, whose dark and hard sound helped spawn the heavy metal genre. Due to Sabbath's dark style, Osbourne became known as the "Prince of Darkness". Osbourne is also known as the "Godfather of Heavy Metal".

In the early 2000s, Osbourne's career expanded when he became a star in his own reality show The Osbournes, alongside wife/manager Sharon and two of their three children, Kelly and Jack. A documentary about his life and career, God Bless Ozzy Osbourne, premiered in April 2011 at the Tribeca Film Festival and was released on DVD in November 2011. Osbourne has achieved multi-platinum status as a solo artist and with Black Sabbath and has sold over 100 million albums worldwide.

John Michael "Ozzy" Osbourne was born in Aston, Birmingham, England, on 3 December 1948. His father Jack worked shifts as a toolmaker at GEC. His mother Lillian worked for the car components firm Lucas. John was the fourth of six children. Ozzy had two brothers (Paul and Tony) and three sisters (Jean, Iris and Gillian); they lived in a small two bedroom home at 14 Lodge Road in Aston. The nickname "Ozzy" was first used when he was in primary school. Although called "John" by his first wife Thelma, Osbourne states that it has been a long time since he's recognised himself when called by his formal name.

Randall William Rhoads (December 6, 1956 – March 19, 1982) was an American heavy metal guitarist who played with Ozzy Osbourne and Quiet Riot. A devoted student of classical guitar, Rhoads combined his classical music influences with his own heavy metal style. Despite his short career, Rhoads is a major influence on neo-classical metal, and is cited as an influence by many guitarists and is included in several "Greatest Guitarist" lists.

At age 14, Rhoads formed a cover band called Violet Fox (after his mother's middle name, Violet), with his older brother Kelle on drums. Violet Fox staged several performances in the "Grand Salon" at Musonia, Delores Rhoads' music school. Among their setlist was "Mississippi Queen" by Mountain, and songs from The Rolling Stones, Alice Cooper and David Bowie. After the dissolution of Violet Fox, Rhoads taught his best friend Kelly Garni how to play bass, and together they formed a band called The Whore (rehearsing during the day at Rodney Bingenheimer's English Disco, a 1970s Hollywood nightspot), spending several months playing at backyard parties around Los Angeles.