In 2009, further changes were made to the political system. Non-Constituency Member of Parliament seats were increased to nine, up from between three and six, and the appointment of Nominated MPs would be mandatory instead of being decided by Parliament. With that, the new Parliament would have the largest number of non-PAP voices since 1963.

The Electoral Boundaries Review Committee report, released on 24 February 2011 after having been placed with the Prime Minister's Office three days earlier, upped the number of SMCs from nine to 12 for the first time in three GEs. The average size of GRCs would be reduced five members, paving way for the return of four-member GRCs that was last seen in the 1997 GE. Also, a one-day cooling-off period before polling day was introduced, extending the difference between the nomination and polling days to at least ten days, up from the minimum nine.

For the second time, PM Lee Hsien Loong was leading PAP into a GE and the most hotly contested one since 1963. The ruling party was fraught with several problems such as rising costs, widening income gap, large influx of foreigners, financial losses incurred by national corporations and several prominent security lapses. The decision to field a young female candidate, Tin Pei Ling, also created some controversy.

Two seats, one within Jurong GRC and the other within Ang Mo Kio GRC, had fallen vacant after the death of PAP MPs Dr Ong Chit Chung in 2008 and Dr S. Balaji in 2010 respectively. However, the PAP government was not obligated by the law to hold by-elections and did not do so despite calls by several opposition parties, NMPs and activists.

Compared to the previous GE, the opposition camp was more fragmented this time. Additional entrants to the fray were NSP and SPP, both which had left the SDA alliance and reverted to their own banners for the first time since 1997, as well as the newly formed RP.

Despite so, its position had strengthened and fielded several high-profile recruits including renowned international lawyer Chen Show Mao who was standing under WP ticket and Senior Minister Goh Chok Tong's former principal private secretary Tan Jee Say who was with SDP. Collectively, the opposition contested nearly seat except for a failed bid in Tanjong Pagar GRC helmed by Minister Mentor Lee Kuan Yew, which could have been the first independent GRC team comprising mostly renegade PKMS and SF members.

Opposition veteran J. B. Jeyaretnam passed away shortly after establishing RP in 2008, leaving it rudderless until his elder son, Kenneth Jeyaretnam took over. He ousted his late father's long-time loyalists, some whom formed SF. RP grew to become possibly the largest opposition party but a spate of resignations before the GE reduced its numbers once again.

Among those who left RP, several joined NSP. One of them, Nicole Seah, caught attention for contesting SM Goh's ward and was seen as a "alter-ago" of Tin. Ang Mo Kio GRC was close to becoming a no-contest until RP borrowed candidates from SF and SPP.

The biggest unprecedented moves were made by the two incumbent opposition MPs, who stepped out of their "safe" seats to contest GRCs. WP secretary-general Low Thia Khiang joined hands with chairman and NCMP Sylvia Lim to contest Aljunied GRC. Replacing him in Hougang was Yaw Shin Leong. Potong Pasir MP Chiam See Tong handed his ward of 28 years to his wife, Lina Loh, to lead a SPP team in Bishan-Toa Payoh GRC.

However, the destinies of WP and SPP went down contrasting paths. WP broke through a GRC for the first time in opposition history while successfully defending its incumbent seat but SPP did not. During the campaign, the cannons of PAP were aimed at Chen, who had been away from Singapore for many years. As polling drew closer, PAP fired directly at the credible Low, causing some ground dissatisfaction.

The six seats clinched by WP was the largest number won by an opposition party and the combined opposition camp since independence, surpassing the three won by SDP and one by WP in 1991. Together with two NCMP seats, WP had bagged eight seats. Loh took up the remaining NCMP seat.

Traditionally regarded as a PAP "fortress", the fall of a GRC saw two PAP ministers voted out. They were the well-liked George Yeo and only woman minister Lim Hwee Hua, in deja vu of 1991 where first woman minister Dr Seet Ai Mee lost her seat. Since independence, this was PAP's lowest share of the votes and the first time opposition candidates were elected in their maiden battle.

Immediately after the GE, MM Lee and SM Goh - both whom were former prime ministers - announced their retirement from the new Cabinet, marking the end of an era.

 
11th Parliament dissolution:
  19 April 2011, Tuesday
Nomination day:
  27 April 2011, Wednesday
Cooling-off day:
  6 May 2011, Friday
Polling day:
  7 May 2011, Saturday
Overseas vote-counting:
  11 May 2011, Wednesday
12th Parliament convention:
  10 October 2011, Monday

Parliament seats:
  87
Electorate:
  2,350,873 [OV: 3,675]
Walkover voters:
  139,771 [OV: 222] (5.9%)
Eligible voters:
  2,211,102 [OV: 3,453] (94.1%)
Voter turnout:
  2,060,373 [OV: 2,683] (93.2%)
Election deposit:
  $16,000 (+$2,500)

Single Member Constituencies 4-Member GRCs 5-Member Group Representation Constituencies
Bukit Panjang SMC Potong Pasir SMC Holland-Bukit Timah GRC Aljunied GRC Nee Soon GRC
Hong Kah North SMC Punggol East SMC Moulmein-Kallang GRC Bishan-Toa Payoh GRC Sembawang GRC
Hougang SMC Radin Mas SMC 6-Member GRCs Chua Chu Kang GRC Tampines GRC
Joo Chiat SMC Sengkang West SMC Ang Mo Kio GRC East Coast GRC Tanjong Pagar GRC
Mountbatten SMC Whampoa SMC Pasir Ris-Punggol GRC Jurong GRC West Coast GRC
Pioneer SMC Yuhua SMC   Marine Parade GRC  
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