Třinec
| Třinec Trzyniec | |
|---|---|
| T. G. Masaryka Square | |
| Coordinates: 49°40′40″N 18°40′22″E / 49.67778°N 18.67278°E | |
| Country | Czech Republic | 
| Region | Moravian-Silesian | 
| District | Frýdek-Místek | 
| First mentioned | 1444 | 
| Government | |
| • Mayor | Věra Palkovská | 
| Area | |
|  • Total | 85.37 km2 (32.96 sq mi) | 
| Elevation | 306 m (1,004 ft) | 
| Population  (2025-01-01) | |
|  • Total | 33,852 | 
| • Density | 400/km2 (1,000/sq mi) | 
| Time zone | UTC+1 (CET) | 
| • Summer (DST) | UTC+2 (CEST) | 
| Postal codes | 739 55, 739 61, 739 94 | 
| Website | www | 
Třinec (Czech: [ˈtr̝̊ɪnɛts] ⓘ; Polish: Trzyniec [ˈtʂɨɲɛt͡s] ⓘ; German: Trzynietz) is a city in Frýdek-Místek District in the Moravian-Silesian Region of the Czech Republic. It has about 34,000 inhabitants, making it the least populated statutory city in the country.
The city is an important cultural centre of the Polish minority in Trans-Olza, which makes up 12.1% of the population (as of 2021).
Třinec is notable for the Třinec Iron and Steel Works steel plant, the largest in the country, which still has a major impact on the city, its character, demographics, and air quality.