| Election Name: | 2023 Taiwanese legislative by-elections |
| Country: | Taiwan |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2020 Taiwanese legislative election |
| Previous Year: | 2020 |
| Election Date: | |
| Next Election: | 2024 Taiwanese legislative election |
| Next Year: | 2024 |
| Seats For Election: | 2 of 113 seats in the Legislative Yuan |
| Image1: | 副總統賴清德官方肖像.jpg |
| Leader1: | Lai Ching-te |
| Party1: | Democratic Progressive Party |
| Leader Since1: | 18 January 2023 |
| Last Election1: | 61 seats |
| Seats Before1: | 61 |
| Seats1: | 1 |
| Seats After1: | 62 |
| Leader2: | Eric Chu |
| Party2: | Kuomintang |
| Leader Since2: | 5 October 2021 |
| Last Election2: | 38 seats |
| Seats Before2: | 37 |
| Seats2: | 1 |
| Seats After2: | 38 |
By-elections for the Tenth Legislative Yuan were held in 2023, one each on 8 January and 4 March, in Taiwan to elect 2 of the 113 members of the Legislative Yuan for the remaining term until 2024. The Democratic Progressive Party flipped a seat from the Kuomintang in Nantou II, and the KMT retained its seat in Taipei III. After the DPP's victory in Nantou II, Frida Tsai would become the first DPP legislator to serve a district in Nantou County since the 2005 constitutional amendment halving the number of legislative seats from 225 to 113.
Under the Article 73 of the, if any positions become vacant due to resignation or election to another office, and the vacated term is longer than one year, a by-election shall be completed within three months commencing from the date of resignation.[1]
A by-election was scheduled in Taipei for 8 January 2023, as Legislative Yuan member Chiang Wan-an had resigned his seat before taking office as Mayor of Taipei.[2] Nantou County legislator Hsu Shu-hua vacated her seat upon taking office as Nantou County magistrate on 25 December 2022, and a by-election for her seat was planned for 4 March 2023.[3]
Voted on 8 January 2023.[9]
Voted on 4 March 2023.[10]