The 38-year-old, whose real name is Calvin Broadus, was originally denied entry in 2007, forcing him and fellow rapper Sean "Diddy" Combs to cancel the British dates of their European tour.
The ban relates to Snoop Dogg's arrest at Heathrow airport in 2006 following a fracas involving members of his entourage.
In 2008 the ban was lifted but when the UK Border Agency challenged the decision, it went to an Asylum and Immigration Tribunal. Earlier this week, the tribunal announced its decision that to deny him entry had been wrong.
"We are disappointed by the tribunal's decision in this case," a UK Border Agency spokesperson said.
