The by-election was held on 10 July 1965, with the nomination day held on 30 June 1965. Merely a month before Singapore's separation from Malaysia and independence, UPP chief, and the party's sole Assembly Member Ong Eng Guan resigned his seat and retired from politics, triggering a by-election.

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Quick Facts Registered, Turnout ...

1965 Hong Lim by-election

← 1961 10 July 1965 1966 →
Registered	11,837
Turnout	10,858 (91.73%) 3.77%
Majority party Minority party   Candidate Lee Khoon Choy Ong Chang Sam Party PAP BS Popular vote 6,398 4,346 Percentage 59.55% 40.45% Swing 26.28% 19.87%
Assemblyman before election Ong Eng Guan UPP Elected Assemblyman Lee Khoon Choy PAP

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This last Legislative Assembly election became a straight fight between Singapore's two main parties, the People's Action Party (PAP) and Barisan Sosialis (BS), and both fielded former PAP AMs as candidates. The PAP was by then a full national party with a presence in Malaysia, despite winning only one seat of the 11 it contested in the federal election of 1964.

After Singapore was ejected from the Federation, PAP's only Malaysian legislator, Devan Nair, converted the party's extension into the Peninsular Malaysia into the Democratic Action Party (DAP), replacing the "thunderflash" in the PAP's symbol with a "rocket", but a few years later he quit Malaysia politics and returned to Singapore. The DAP remains a political party in Malaysia to this day, being as of 2019 part of the Pakatan Harapan coalition.

This was the last Legislative Assembly election to see a straight fight between the PAP and BS.

The following year, BS withdrew all its members from parliament; it went on to boycott the next election, in 1968.

The election deposit was set at $500.

• Background of 1965 Hong Lim By Election
• 1965 Hong Lim By Election's Results