Singapore, officially the State of Singapore, was one of the 14 states of Malaysia from 1963 to 1965. Malaysia was formed on 16 September 1963 by the merger of the Federation of Malaya with the former British colonies of North Borneo, Sarawak and Singapore. This marked the end of the 144-year British rule in Singapore which began with the founding of modern Singapore by Sir Stamford Raffles in 1819. At the time of merger, it was the smallest state in the country by land area, but the largest by population.

The states and federal territories of Malaysia are the principal administrative divisions of Malaysia. Malaysia is a federation of 13 states (Negeri) and 3 federal territories.