| Constituency | Date | Incumbent | Party | Winner | Party | Cause |
|---|
| Nantou II | 4 March 2023 | Hsu Shu-hua | | Kuomintang | Frida Tsai | | Democratic Progressive | Elected as Magistrate of Nantou County |
| Taipei III | 8 January 2023 | Chiang Wan-an | | Kuomintang | Wang Hung-wei | | Kuomintang | Resigned to run in election |
| Taichung II | 9 January 2022 | Chen Po-wei | | Statebuilding | Lin Ching-yi | | Democratic Progressive | Recalled |
| Changhua I | 16 March 2019 | Wang Huei-mei | | Kuomintang | Ko Cheng-fang | | Kuomintang | Elected as Magistrate of Changhua County |
| New Taipei III | 16 March 2019 | Gao Jyh-peng | | Democratic Progressive | Yu Tian | | Democratic Progressive | Disqualified after conviction |
| Kinmen | 16 March 2019 | Yang Cheng-wu | | Kuomintang | Chen Yu-chen | | Independent | Elected as Magistrate of Kinmen County |
| Tainan II | 16 March 2019 | Huang Wei-che | | Democratic Progressive | Kuo Kuo-wen | | Democratic Progressive | Elected as Mayor of Tainan |
| Taichung V | 27 January 2019 | Lu Shiow-yen | | Kuomintang | Shen Chih-hwei | | Kuomintang | Resigned to run in election |
| Taipei II | 27 January 2019 | Pasuya Yao | | Democratic Progressive | Ho Chih-wei | | Democratic Progressive | Resigned to run in election |
| Changhua IV | 7 February 2015 | Wei Ming-ku | | Democratic Progressive | Chen Su-yueh | | Democratic Progressive | Resigned to run in election |
| Miaoli II | 7 February 2015 | Hsu Yao-chang | | Kuomintang | Hsu Chih-jung | | Kuomintang | Elected as Magistrate of Miaoli County |
| Nantou II | 7 February 2015 | Lin Ming-chen | | Kuomintang | Hsu Shu-hua | | Kuomintang | Elected as Magistrate of Nantou County |
| Pingtung III | 7 February 2015 | Pan Men-an | | Democratic Progressive | Chuang Jui-hsiung | | Democratic Progressive | Elected as Magistrate of Pingtung County |
| Taichung VI | 7 February 2015 | Lin Chia-lung | | Democratic Progressive | Huang Kuo-shu | | Democratic Progressive | Resigned to run in election |
| Taichung II | 26 January 2013 | Yen Ching-piao | | NPSU | Yen Kuan-heng | | Kuomintang | Disqualified after conviction |
| Kaohsiung IV | 5 March 2011 | Chen Chi-yu | | Democratic Progressive | Lin Tai-hua | | Democratic Progressive | Became Deputy Mayor of Kaohsiung |
| Tainan IV | 5 March 2011 | Lai Ching-te | | Democratic Progressive | Hsu Tain-tsair | | Democratic Progressive | Elected as Mayor of Tainan |
| Chiayi County II | 27 February 2010 | Helen Chang | | Democratic Progressive | Chen Ming-wen | | Democratic Progressive | Resigned to run in election |
| Hsinchu County | 27 February 2010 | Chiu Ching-chun | | Kuomintang | Perng Shaw-jiin | | Democratic Progressive | Elected as Magistrate of Hsinchu County |
| Hualien County | 27 February 2010 | Fu Kun-chi | | Kuomintang/PFP | Wang Ting-son | | Kuomintang | Elected as Magistrate of Hualien County |
| Taoyuan III | 27 February 2010 | John Wu | | Kuomintang | Huang Jen-shu | | Democratic Progressive | Elected as Magistrate of Taoyuan County |
| Taichung County III | 9 January 2010 | Chiang Lien-fu | | Kuomintang | Tony Jian | | Democratic Progressive | Election annulled over fraud |
| Taitung County | 9 January 2010 | Justin Huang | | Kuomintang | Lie Kuen-cheng | | Democratic Progressive | Resigned to run in election |
| Taoyuan II | 9 January 2010 | Liao Cheng-ching | | Kuomintang | Kuo Jung-tsung | | Democratic Progressive | Election annulled over fraud |
| Nantou I | 5 December 2009 | Wu Den-yih | | Kuomintang | Ma Wen-chun | | Kuomintang | BecamePremier of the Republic of China |
| Yunlin II | 26 September 2009 | Chang Sho-wen | | Kuomintang | Liu Chien-kuo | | Democratic Progressive | Election annulled over fraud |
| Taipei VI | 28 March 2009 | Diane Lee | | Kuomintang | Chiang Nai-shin | | Kuomintang | Resigned over dual citizenship |
| Miaoli I | 14 March 2009 | Lee Yi-ting | | Kuomintang | Kang Shih-ju | | Independent | Election annulled over fraud |
| Chiayi | 11 March 2006 | Huang Min-hui | | Kuomintang | Chiang Yi-hsiung | | Kuomintang | Elected as Mayor of Chiayi |
| Hualien County | 12 March 1995 | Hsieh Shen-shan | | Kuomintang | Chang Wea | | Independent | Became Minister ofCouncil of Labor Affairs of theRepublic of China |