January
- January 8 - The Ministry of National Development launches the "Remaking Our Heartland" plans at Hougang, with the vision "Colours of Hougang - Enriching and Engaging".
- January 11 - The Land Transport Authority announces four new MRT stations for Tuas West Extension which will be ready by 2016.
- January 15 - The Ministry of National Development launches the "Remaking Our Heartland" plans at East Coast, with the vision "Gateway to the East Coast".
- January 19 - The Land Transport Authority announces the building of a new expressway, North-South Expressway, which will be ready by 2020.
- January 22 - The Ministry of National Development launches the "Remaking Our Heartland" plans at Jurong Lake District.
- January 23 - Woodlands Waterfront officially opens.
- January 29 - The Sentosa Boardwalk opens.
- January 30 - Heavy and intense downpour causes flash floods around Singapore.
February
- February 17 - Marina Bay Sands officially opens, ArtScience Museum and a free night show, known as Wonder Full debut.
- February 18 - The Singapore Budget 2011, with the theme "Growing Incomes, Strengthening Our Society" is announced. The key highlight being the S$13b in benefits for Singaporeans. Radio and television licence fees are permanently removed with immediate effect.
- February 21 - The re-opening of Battlestar Galactica ride in Universal Studios Singapore after a technical glitch caused it to be closed just one week after opening.
March
- March 3 - Disney's The Lion King musical production debuts at the Marina Bay Sands Theatre.
- March 5 - The Lorong Halus Wetland and riverfront promenade are officially launched.
- March 11 - The Singapore Exchange (SGX) has filed a formal application with Australia's Foreign Investment Review Board for acquiring the Australian Securities Exchange (ASX).
- March 13 to May 15 - Singapore Biennale 2011.
- March 22 - Finance Minister Tharman Shanmugaratnam chairs the International Monetary and Financial Committee.
- March 25 - Brigadier General Ravinder Singh is the new Chief of Army for the Singapore Army.
- March 31 - National Equestrian Park officially opens.
April
- April 8 - The Government of Australia officially blocked the proposed merger of SGX and ASX.
- April 8 - The Tanjong Pagar Railway Station is gazetted as a national monument and the Bukit Timah Railway Station is gazetted as a conserved building.
- April 16 - Singapore Day 2011 at Century Park in Shanghai.
May
- May 13 to June 5 - Singapore Arts Festival 2011.
- May 7 - Parliamentary Elections
- May 16 - Cathay Pacific Flight 715, an Airbus A330-300, made an emergency landing at Singapore Changi Airport following an engine fire shortly after takeoff. No one was hurt.
- May 16 - The opening of Madagascar: A Crate Adventure in Universal Studios Singapore.
- May 21 - SingTel successfully launched Singapore's second commercial satellite, ST-2, into orbit following a lift-off from Kourou, French Guiana.
- May 25 - Singapore Airlines announced it will be launching a new medium and long-haul low-cost carrier within a year.
- May 27 - New Platform at Jurong East MRT Station opens.
- May 27 - The Ministry of National Development announces changes in town councils.
- May 27 to July 24 - The Great Singapore Sale.
- May 28 - Grand opening of Universal Studios Singapore.
June
- June 3 to 5 - The 10th Shangri-La Dialogue.
- June 5 - Heavy and intense downpour causes flash floods around Singapore.
- June 7 - Singapore Airlines and Virgin Australia establish a long-term alliance.
- June 20 - Woodleigh MRT Station and Damai LRT Station open.
- June 21 - M1 Limited launches South-East Asia first ultra-high speed mobile services with Long Term Evolution.
July
- July 1 - Keretapi Tanah Melayu's Tanjong Pagar railway station relocated to the Woodlands Train Checkpoint.
- July 15 to 24 - Singapore Food Festival 2011.
August
- August 9 - Singapore celebrates her 46th (XLVI) year of independence with National Day Parade, 2011.
- August 13 to 19 - The first Singapore Youth Olympic Festival.
- August 14 - National Day Rally 2011.
- August 28 - Presidential Elections
- August 31 - Singapore's first Water Agreement with Malaysia expires.
- August 31 - Ocean Financial Centre opened.
October
- October 8 - Stages 4 and 5 of the Circle MRT Line will be open.
- October 8 - Bus and train fares will increase overall by 1%.
- October 8 - Official launch of SGTrains Official Site.
- October 10 - The first session of the 12th Parliament of Singapore begins.
- October 15 - The Maritime Experiential Museum & Aquarium opened in Resorts World Sentosa.
- October 27 - Transformers: The Ride opened at Universal Studios Singapore.
November
- November 8 - Asia Square Tower 1 opened.
- November 13 to 20 - The 20th World Orchid Conference held at Marina Bay Sands Expo and Convention Centre.
- November 14 - The Flower Dome of the Gardens by the Bay opened to the public for a week-long preview
December
- December 14 - Circle MRT Line partially disrupted for six hours.
- December 15 - North South MRT Line partially disrupted for four hours.
- December 17 - North South MRT Line partially disrupted for seven hours.
- December 18 - North South MRT Line and East West MRT Line to start operations at 10 am. East West MRT Line resumed operations at 11am and North South MRT Line resumed operations at 12pm
SEA Games 2011
42 Gold ~ 45 Sliver ~ 73 Bronze ~ 160 Medals.
Source : Wikipedia.