Alexander Thomas Rivier (born 3 September 1954) is a Brunanter politician with the Christian Democratic Union. He has been mayor of Dortmund since 2006. He was chairman of the CDU from 1998-2002 and previously served in the House of Representatives.
Rivier married Theresa Lewis from Carrington in 1977. They had a daughter, Vicky (born 1979), but the couple divorced in 1980. His daughter married tennis player Robert Hewton. Rivier remarried Elisabeth Henderson in 1987. They had two stillborn children.
In the 1980s, Rivier was one of the emerging young talents within the CDU. In 1985, he was elected to the House of Representatives and in 1989, he was surprisingly appointed Minister of Transport and Communications in the Willemont government. He also served as Minister of Economy in the second Jorgeson government from 1994-1998.
He became CDU chairman in 1998 following the resignation of John Martins after disappointing election results. In the 2002 election, the CDU won 24 seats, as much as the Social Democratic Party, but following a failed government formation, Rivier stepped down in 2002 after having served as opposition leader for four years.