The 24-year-old singer, flanked by his customary squad of bodyguards, emerged from Wormwood Scrubs prison in west London and declared to the waiting media: "Only God will judge me."
Morrison was jailed for three months in May, following a run-in with police in an all-night shop in Notting Hill, west London, during which he threatened officers with a highly dangerous electric weapon, modelled on a cattle-prod.
The singer was hailed as the future of British soul for his first hit, Return of the Mack, but his "bad boy" antics have repeatedly got him into trouble. His public pronouncements, meanwhile, have earned headlines in the music press such as "Return of the mouth".
Morrison was jailed as Return of the Mack reached number three in the US charts. The sentence forced the postponement of plans for a promotional tour of the US, and he wept as he was led away from the court to begin his sentence.
At the start of his jail term, Morrison's solicitor, Colin Nott, predicted that a prison term would wreck his career.