Per Erik Gunnar Westerberg (born 2 August 1951) is a Swedish Moderate Party politician and as of 2006 the current Speaker of the Riksdag.
Westerberg was born in Nyköping and graduated from Stockholm School of Economics in 1974. His family has been running a family business for generations and he is now the richest member of the Riksdag, with a personal wealth exceeding 200 million SEK, (around $30 million 2006). His brother, Lars Westerberg, is CEO of Autoliv.
Per Westerberg has been active within Moderate politics since the election campaign in 1966, when he joined the Moderate Youth League. In 1979, he was elected to the Riksdag for his home county of Södermanland. He is the current longest serving member of the Riksdag, even though that is not what requires him to be the Speaker. During the Moderate-led government 1991-1994, Westerberg served as Minister for Industry and Trade. In 2003 he was elected one of the three Vice Speakers of the Riksdag. On October 2, 2006 he was elected Speaker of the Riksdag.
Per Westerberg and his family continue to make their home in Nyköping and he continues to serve on the Board of the Moderate Party and as chairman of the Moderate Party in Södermanland.