Hsu Tain-tsair (Chinese: 許添財; pinyin: Xǔ Tiāncái; Wade–Giles: Hsu3 Tien1-tsai2; Pe̍h-ōe-jī: Khó͘ Thiam-châi; born 23 January 1953) is a Taiwanese politician who served as the mayor of Tainan City from 2001 to 2010.

In 1976, Hsu earned a Master of Economics degree from Chinese Culture University and started teaching banking the next year at the same school.

With the influence of legislators Chen Shui-bian, Peng Pai-hsien, Hung Chi-chang, and Lu Hsiu-yi, the government relented and removed the restriction for Hsu to exit and enter the country, finally issuing him a new passport.

He lost the election for the office of mayor of Tainan in 1997 and instead became the secretary-general of the New National Coalition (新國家連線) shortly after the establishment of the organization.

In his terms as mayor, he focused on projects to beautify the city, set up cultural parks, and strive for major constructions.

One of his major goals, the renovation of the Tainan Railway Station and National Cheng Kung University, was scheduled to be completed during his term in office and has earned him high compliments.

[10] During the DPP primary election in May, he lost to fellow Tainan politician William Lai by 12% of the votes, ending his candidacy.

[14] While the National Central Library is located in Taipei, Hsu strongly supports the establishment of a regional branch in Tainan City.

Other historical sites covered by the regulation include Tainan Confucian Temple, Fort Zeelandia, and Eternal Golden Castle.

[22][23] In January 2008, the government of Tainan started an operation to clean up dioxin-contaminated soil around the site of a defunct factory of Taiwan Alkali Industrial Corp (台鹼公司).

[24] Due to an accidental killing of a teenage girl, while trying to shoot a psychotic suspect, the Tainan City Police Bureau made a decision to develop a special kind of baton in 2006.

[25] In September 2007, the Tourism Mounted Police Unit of Tainan (Chinese: 臺南市觀光騎警隊) was established to attract tourists.

[28] On 22 August, Mayor Hsu apologized for the disastrous outbreak of dengue fever; he announced that the health department would be reorganized and new officials would be appointed in six months.

[29] While the then-mayor of Taipei Ma Ying-jeou was indicted for alleged misuse of "special allowance fund," prosecutors dropped Hsu Tain-tsair's case in March 2007.

[30] However, on 10 April 2007, Hsu was indicted by prosecutors for his alleged involvement in a construction scandal and violations of the Government Procurement Act (Chinese: 政府採購法).

In their statement of charges, the prosecutors accused Hsu of money grafting in an underground city construction project.