Dumitru Diacov was a Moldovan MP (1994–2001, 2005-May 2009, July 2009 – 2010) and the president of the Moldovan Parliament (23 April 1998 – 20 March 2001).
He was president of the Democratic Party of Moldova (1997-June 2009) and later has been the honorary president. In November 2022, when the Democratic Party was turned into the European Social Democratic Party, he opposed this change and he didn't join the new party. Due to this, he was removed from the position as honorary president.[4]