Nyland and Tavastehus County, or Uusimaa and Häme Province, was a county of the Swedish Empire from 1634 to 1809, and a county of Grand Duchy of Finland from 1809 to 1831.
In 1775 whole northern part of the county (later Central Finland region) was transferred to the new Vasa County. Also a part of historical Satakunta was added to the Nyland and Tavastehus County from the àbo and Björneborg County, while Upper Hollola was transferred to the new KymmenegÃÂ¥rd County.
By the Treaty of Fredrikshamn in 1809 Sweden ceded all its territories in Finland, east of the Torne River, to Russia. The county still continued to exist as a province of the new autonomous Grand Duchy of Finland until 1831, when it was split to Tavastehus County (Häme Province) and Nyland County (Uusimaa Province).