| Tứ Kỳ district | |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name1: | Red River Delta |
| Subdivision Type2: | Province |
| Subdivision Name2: | Hải Dương |
| Seat Type: | Capital |
| Seat: | Thanh Miện |
| Unit Pref: | Imperial |
| Area Total Km2: | 165 |
| Population As Of: | 2018 |
| Population Total: | 152,541 |
| Population Density Km2: | 923 |
| Timezone: | Indochina Time |
| Utc Offset: | +07:00 |
Tu Ky (vi|Tứ Kỳ) is a district (huyện) of Hải Dương province in the Red River Delta region of Vietnam.
As of 2003 the district had a population of 167,664. The district covers an area of 168sqkm. The district capital lies at Tứ Kỳ.[1]