This was the year's third by-election - the only year in Singapore history with three consecutive by-elections - after another spate of resignations by BS Members of Parliament. This time, Chia Thye Poh and Lee Tee Tong quit their Parliament seats. Chia would later be detained under the Internal Security Act for 22 years and become the world's second-longest incarcerated political prisoner. In addition, PAP MP Dr Fong Kim Heng resigned his seat due to poor health. Once again, all contested seats were conceded to PAP via walkovers.

Nomination day: 2 November 1966 [Wed]

Eligible voters: 39,371

Election deposit: $500

RESULTS
Bukit Timah	Joo Chiat	Jurong
Total seats = 3