| Sini Häkkinen | |
| Fullname: | Sini Häkkinen |
| Nationality: | Finnish |
| Birth Date: | 19 March 1990 |
| Birth Place: | Helsinki, Finland |
Sini Häkkinen (born 1990) is a Finnish volleyball player.[1] Her playing position is wing spiker. She has played 11 times with the Finnish national women's volleyball team.[2] The clubs she has played for include Pihtiputaan Ploki, Pislaploki and LP Viesti Salo.[3] She is right-handed and 1.83 m tall.