A by-election for the Hougang Single Member Constituency in Singapore was held on 26 May 2012 with Png Eng Huat from the Worker's Party as the winning candidate. This followed due to the expulsion of Yaw Shin Leong from the Worker's Party on 15 February 2012, which he decided not to appeal. On 22 February 2012, the Speaker Michael Palmer declared the seat vacant, effective from the date of expulsion, as required by the Constitution of the Republic of Singapore.