| Election Name: | 1970 Singaporean by-elections |
| Country: | Singapore |
| Flag Year: | 1970 |
| Flag Image: | Flag of Singapore.svg |
| Type: | legislative |
| Previous Election: | 1967 Singaporean by-elections |
| Previous Year: | 1967 |
| Next Election: | 1977 Singaporean by-elections |
| Next Year: | 1977 |
| Seats For Election: | 5 seats to the Parliament of Singapore |
| Election Date: | 18 April 1970 |
| Registered: | 25,310 |
| Turnout: | 21,550 (85.14%) |
| Image1: | Prime Minister Lee Kuan Yew of Singapore Making a Toast at a State Dinner Held in His Honor, 1975.jpg |
| Image1 Size: | 150x150px |
| Leader1: | Lee Kuan Yew |
| Party1: | People's Action Party |
| Seats1: | 5 |
| Popular Vote1: | 14,545 |
| Percentage1: | 69.93% |
| Party2: | United National Front (Singapore) |
| Seats2: | 0 |
| Popular Vote2: | 6,255 |
| Percentage2: | 30.07% |
| MPs | |
| Before Party: | PAP |
| Posttitle: | Elected MPs |
| After Party: | PAP |
The by-elections were held in April, for five seats in the Parliament of Singapore, after the resignation of Members of Parliament of the People's Action Party (PAP). The PAP won all five seats; with three of them in an uncontested walkover.
At the time of the 1968 general election, mass resignations by the members of Barisan Sosialis in the parliament, who opted to protest and "struggle for democracy" on the streets, had effectively removed all opposition from the parliament. In 1970, however, it was five members from the governing People's Action Party who were invited to resign and give way to new blood as a part of renewing PAP's ranks.
The resulting vacancies were in the constituencies of Delta, Havelock, Kampong Kapor, Ulu Pandan and Whampoa. By-elections were arranged, with nomination day set as 8 April 1970 and polling day as 18 April 1970.
Similar to 1968 general election, no opposition parties stood except a newly formed United National Front formed from remnants of the defunct Singapore Alliance. This party stood candidates in two seats out of the five, namely Kampong Kapor and Ulu Pandan. Once again the PAP won the other three by walkovers.
The election deposit was set at $500. Similar to previous elections, the election deposit would be forfeited if the particular candidate had failed to secure at least 12.5% or one-eighth of the votes.