Tavastia (formerly Tavastia South) is a Finnish constituency represented in eduskunta. It covers the administrative regions of Kanta-Häme and Päijät-Häme, with a combined population of about 364,000 (as of 2002[update]). Tavastia currently 14 members to eduskunta.
The constituency is largely urban, centred on the cities of Hämeenlinna and Lahti. The largest party in the 2011 election was the Social Democratic Party of Finland.
In official statistics of Finland the parliamentary elections are always compared with both the previous parliamentary elections and municipal elections. The municipal elections will be held in 2012. In Tavastia electoral district Kanta-Häme wins more parliamentary seats than Päijät-Häme as 1/4 of the votes for the candidates from Kanta-Häme is achieved from Päijät-Häme. As for the Centre Party this has been due to the expertise of the agricultural policies affecting the agrarian surroundings of the city of Lahti and as for the Social Democratic Party of Finland hard campaigning in Lahti and on its surroundings from Kanta-Häme. Both of the regions compete with each other's in the front of the state.