Hou Yu-ih (Chinese: 侯友宜; pinyin: Hóu Yǒuyí; born 6 June 1956) is a Taiwanese politician, criminologist, and former police officer.

[1] Previously, he served as Director-General of the National Police Agency from 2006 to 2008 and as acting mayor of New Taipei City from October 2015 to January 2016.

[6] The next year, Hou was tasked with investigating the March 19 shooting incident,[7] an assassination attempt on President Chen Shui-bian, a longtime friend.

Arms dealer Tang Shou-yi, who had fled to Mainland China by August 2006, had recanted his confession, stating that it was coerced and therefore untrue.

[16] Hou served as deputy mayor alongside Lee Shu-chuan and Hsu Chih-chien who left office on 25 February 2014 and 30 June 2014, respectively.

[34][35] On 15 November 2023, KMT and Taiwan People's Party leadership announced that they would field a single joint presidential ticket made up of Hou and TPP chairman Ko Wen-je.

The order was to be determined by opinion polls and publicly announced on 18 November,[36] but the parties were unable to reach an agreement on that date.

[37] Hou officially registered his candidacy with running mate Jaw Shaw-kong on 24 November 2023, ending the possibility of a joint ticket.