| Mats Nyby | |
| Birth Date: | 17 November 1946 |
| Birth Place: | Jakobstad, Finland |
| Death Place: | Jakobstad, Finland |
| Nationality: | Finnish |
| Party: | SDP |
| Office: | Member of the Parliament of Finland |
| Term Start: | 1983 |
| Term End: | 1999 |
| Constituency: | Vaasa |
Mats Nyby (17 November 1946 – 11 May 2021) was a Finnish politician.[1] A member of the Social Democratic Party of Finland (SDP), he served in Parliament from 1983 to 1999.[2]
Nyby was heavily involved in the local politics of his hometown, Jakobstad. He chaired the city council from 1983 to 1996 and was awarded the title of ('city councilor') by President Tarja Halonen in 2008.[3]
Before moving into politics, Nyby was a schoolteacher in Jakobstad.