Marek Siwiec

Marek Siwiec
Siwiec in 2014
Head of the Chancellery of the Sejm
Assumed office
24 November 2025
MarshalWłodzimierz Czarzasty
Preceded byJacek Cichocki
Vice-President of the European Parliament
In office
16 January 2007 – 13 July 2009
Serving with thirteen others
PresidentHans-Gert Pöttering
Member of the European Parliament
for Greater Poland
In office
20 July 2004 – 30 June 2014
Head of the National security Bureau
In office
19 February 1997 – 17 June 2004
PresidentAleksander Kwaśniewski
Preceded byJerzy Milewski
Succeeded byTadeusz Bałachowicz (acting)
Jerzy Bahr
Secretary of State in the Chancellery of the President of Poland
In office
1996 – 17 June 2004
PresidentAleksander Kwaśniewski
Member of the Sejm
In office
1991–1997
Personal details
BornMarek Maciej Siwiec
(1955-03-13) 13 March 1955

Marek Maciej Siwiec (born 13 March 1955) is a Polish politician and journalist who served as a member of the Sejm from 1991 to 1997 and as a Member of the European Parliament from 2004 to 2014. He was Vice-President of the European Parliament between 2007 and 2009. Within the Chancellery of President Aleksander Kwaśniewski, Siwiec served as Secretary of State from 1996 and as the Head of the National Security Bureau from 1997 to 2004. Since 2025, he has been the Head of the Sejm Chancellery under Marshal Włodzimierz Czarzasty.