| Day Guey-ing | |
| Native Name Lang: | zh-hant |
| Office1: | Deputy Minister of Department of Health of the Republic of China |
| Minister1: | Chiu Wen-ta |
| Term Start1: | 4 September 2012[1] |
| Term End1: | July 2013 |
| Successor1: | Tseng Chung-ming |
| Nationality: | Republic of China |
| Alma Mater: | National Taiwan University |
Day Guey-ing is a Taiwanese physician and politician. She was the deputy minister of the Department of Health in 2012–2013.[2]
Speaking at the Executive Yuan in early May 2013 in responding to the amendment by the cabinet to raise the tax and health and welfare surcharge on tobacco to help reduce Taiwanese who smoke, Day said that even when the Legislative Yuan approves the bill, it will not meet the standard set by the World Bank because the value is still less than standard. She said that an extra increase is needed to meet the standard. The extra revenues received would be used to fund various welfare projects around Taiwan.[3]