William McKeeva Bush, is a Caymanian politician, former Speaker of the Parliament of the Cayman Islands and former Premier of the Cayman Islands. Bush, the former leader of the Cayman Democratic Party, is the elected member for the constituency of West Bay West. He is the territory's longest ever serving political figure with service spanning over 35 years, previously serving his tenth term in the Parliament of the Cayman Islands.

The Premier of the Cayman Islands is the political leader and head of government. The post of premier in the Cayman Islands is the equivalent to chief minister or prime minister in other British Overseas Territories. It is the highest political level that can be attained within the British overseas territory. Prior to 2009, the position was known as Leader of Government Business.