The 2019 Sandakan by-election was a by-election held on 11 May 2019 for the Dewan Rakyat seat of Sandakan. It was called following the death of incumbent, Wong Tien Fatt on 28 March 2019. Wong was a 2-term Member of Parliament for Sandakan since 2013. He was a member and Sabah state party chairman (2015-2019) of the Democratic Action Party (DAP), a component party of the Pakatan Harapan (PH) coalition. Vivian Wong Shir Yee of DAP won the by-election by 16,012 votes out of the 21,595 votes cast with a bigger majority of 11,521 votes despite at a lower turnout rate at 54.44%.