2012 in Singapore
- 14 January – Circle Line Extension (CCLe) opened, extending from Promenade MRT Station to Bayfront and Marina Bay MRT Station
- 15 February – Yaw Shin Leong was sacked from Workers' Party.
- 15 March – North East Line train disruption, from HarbourFront to Dhoby Ghaut.
- 9 May – Writ of Election was issued for the Hougang by-election.
- 16 May – Nomination Day for Hougang by-election
- 26 May – Polling Day for Hougang by-election
- 9 August – Singapore celebrates its 47th (XLVII) national day with her NDP 2012 held at the Float at Marina Bay and it was the first National Day Parade for Dr Tony Tan Keng Yam as President of the Republic Of Singapore.
- 12 December – Speaker of Parliament and MP of Punggol East SMC, Michael Palmer resigned due to an extra-marital affair.
- 27 July – 12 August – Team Singapore took part in the 2012 Summer Olympics in London.
- 29 August – 9 September – Team Singapore took part in the 2012 Summer Paralympics in London.
- 23 September – Singapore host hosted a leg of the 2012 Formula One World Championship, called the 2012 Formula 1 SingTel Singapore Grand Prix.
3 February – Dr Toh Chin Chye, one of the founding fathers of Singapore, died in his sleep on 3 February 2012 at 9:30 am (GMT+8). He was 90 years of age. He was the one who helped to design Singapore's national flag and was Singapore's former Deputy PM from 1965–1968 and as well serving as Minister for Science and Technology (1968–1975) and Minister for Health (1975–1981). He was survived by his son-in-law and four grandchildren aged 4 to 15. His funeral was held on 7 February 2012 at the Mandai Crematorium.
10 March – Tan Boon Teik, who had suffered from Parkinson's disease for the last 15 years of his life, collapsed suddenly from internal bleeding and died on 10 March 2012, aged 83. The funeral was held on 13 March at the Roman Catholic Church of Saint Ignatius, followed by a private cremation at Mandai Crematorium. Tan was survived by his wife Mrs. Tan Sook Yee, his son Pip Tan Seng Hin and daughter Tan Sui Lin, and five grandchildren.
5 June – Lim Hock Siew, one of the founding members of People's Action Party and also one of the ISA detainees of Operation Coldstore, died on 4 June 2012. The wake was held at 135 Joo Chiat Terrace from 5 to 8 June and followed by the funeral on 8 June. He was cremated on 8 June at the crematorium at Kong Meng San Phor Kark See Monastery. He was survived by his wife, a son and daughter-in-law, and a grandson.