The Shower Posse is a Jamaican gang, started by Lester Lloyd Coke, which is involved in drug and arms smuggling. Its home is in Tivoli Gardens in Jamaica. It has several North American branches. The North American branches were first founded by Vivian Blake in the Canadian city of Toronto, Ontario. The gang operates in expatriate Jamaican communities in the US states of New York, New Jersey, Pennsylvania, and the city of Miami, Florida.

There are differing reports on the origin of the name. One theory is that it comes from the promises of its associated politicians to shower supporters with gifts. Another view is that it is a reference to the gang showering opponents with bullets. A third theory is that the gang got its name from the Jamaica Labour Party (JLP) election slogan 'Shower', which was a response to the PNP's 'Power' that was coined from Manley's 'Power for the people' slogan in the 1970s.

The Shower Posse originated in the Tivoli Gardens neighbourhood of Kingston circa 1981. One of the gang's founders, Lester Lloyd "Jim Brown" Coke, became the chief political enforcer for the Jamaica Labour Party (JLP) in West Kingston after the death of Claude Massop, who was killed in a shootout with police in February 1979. With the assistance of the United States, Edward Seaga's JLP ousted the People's National Party (PNP) led by Michael Manley, who was alleged to be aligned with Fidel Castro of Cuba, in the 1980 Jamaican general election.

In exchange for the United States' support, the JLP embarked on a campaign of ganja eradication. As ganja was a major cash crop for some Jamaicans, the destruction of acres of the seedlings, sometimes with chemicals which also destroyed legal crops, paved the way for Jamaica to become a major trans-shipment point for cocaine from South America to the United States. The Shower Posse exploited the cocaine trade to amass wealth and influence. The JLP-aligned Shower Posse has been provided with arms, training, and transport to the United States by the Central Intelligence Agency (CIA). The gang's primary activities involve the distribution of crack cocaine and marijuana, and the theft or illegal purchase and exportation of firearms, using violence to expand into new territories.

Coke led the Shower Posse from Kingston while Vivian Blake, who was the other of the two leading figures in the gang, became the gang's most senior member in the United States. According to Metro-Dade Police Department Sergeant Kevin Dougherty, who investigated Coke: "It seemed like Miami was their secondary base of operations". Blake established the Shower Posse's U.S. operations, with cells in Miami, New York City, Kansas City, Chicago, Philadelphia, Los Angeles and other cities, primarily on the East Coast. The Shower Posse became the first Jamaican gang to branch out of New York City into South Jersey. In New Jersey, the gang formed drug networks in Newark, East Orange, Irvington, Camden, Atlantic City, Vineland, Trenton and Bridgeton.

In 1985, Donovan Clarke founded a Shower Posse cell in Philadelphia and the South Jersey counties of Atlantic, Burlington and Camden. The Dog Posse challenged the Shower Posse for control of operations in New Jersey and Philadelphia. On 4 August 1985, a gun battle erupted at a picnic attended by approximately 2,000 Jamaicans in Oakland, New Jersey, during which elements of the Shower Posse and Spangler Posse from Brooklyn and the Bronx fought with the Boston-based Dog Posse and Tel Aviv Posse. Three people were killed, nine were wounded, and police retrieved thirty-three handguns from the scene.

In September 1988, a federal grand jury in Miami indicted 34 members of the Shower Posse, including Blake and Coke. Blake's two half-brothers, Errol Hussing and Tony Bruce, who headed the New York City operations of the Shower Posse, were also indicted.

The Shower Posse was involved in a drug war with the Junior Black Mafia in Southwest Philadelphia during the 1980s and early 1990s.