Roger Tiefensee (born 1967) is a Swedish Centre Party politician, member of the Riksdag since 2002. After the 2010 Swedish election, he was named the Centre Party's parliamentary group leader. The Riksdag (officially Swedish: Sveriges riksdag) is the national legislative assembly of Sweden. The riksdag is a unicameral assembly with 349 members (Swedish: riksdagsledamöter), who are elected on a proportional basis to serve fixed terms of four years. It is located in the Riksdag building (Riksdagshuset), on the island of Helgeandsholmen in Stockholm.