The President of the Republic of Singapore is Singapore's head of state. In a Westminster parliamentary system, which Singapore governs itself as, the prime minister is the head of the government while the position of president is largely ceremonial. Before 1993, the President of Singapore was chosen by Parliament. Following amendments to the constitution enacted in 1991, the Presidency became a popularly-elected office. The first President elected by the people was Ong Teng Cheong, who served from 1 September 1993 to 31 August 1999. The current President of Singapore is Tony Tan Keng Yam.
The President of the Republic of Singapore is a ceremonial head of state broadly analogous to the Sovereign of the United Kingdom, but the 1991 constitutional amendments gave the President certain reserve powers over government expenditure of financial reserves and appointments to key public offices. The President's official residence is the Istana.