The 24-year-old was arrested over an alleged assault on two men in north London in the early hours of Wednesday morning. After she attended voluntarily a questioning, she was released with a formal caution Saturday.
"She has left the police station. She has been cautioned for common assault," a Scotland Yard spokesman confirmed.
Winehouse's spokesman, Chris Goodman, said in a statement: "Amy Winehouse was fully cooperative and apologized for the incident.
"She thanked the police for their professional handling of the matter. There will be no further action taken.
"Amy is looking forward to continuing her work on new music in the studio," said her spokesman.
The assault will remain on Winehouse's permanent record and could count against her if she is ever charged for a similar offense in the future.
The troubled singer's increasingly troubled private life and battle against drug addiction have overshadowed her recording success.
Winehouse and her husband, Blake Fielder-Civil, were arrested in Norway in October on charges of drug possession.
Also she was arrested in London in December on suspicion of attempting to interfere with a court case involving her husband, who appeared in court on Friday charged with attempting to pervert the course of justice and inflicting grievous bodily harm.
(Agencies)
