8 February – Fabienne Gaul replaces Marie-Thérèse Gantenbein-Koullen in the Chamber of Deputies, after Gantenbein-Koullen retires.
11 March – Patrick Santer resigns from the Chamber of Deputies.
12 March – After the confrontation of December 2008 over euthanasia, the constitution of Luxembourg is amended to change the Grand Duke's power as from 'promulgating' law to 'sanctioning' law: removing his veto.
13 March - Luxembourg announces that it will provide details of private bank clients to foreign tax authorities if 'concrete proof' of tax evasion is provided.
17 March – Following the constitutional amendment, the Chamber of Deputies votes 30-26 to legalise euthanasia. The Grand Duke refuses to sign the law, but no longer has the power to veto it.
17 March – Raymond Weydert replaces Patrick Santer in the Chamber of Deputies.
1 April – Luxembourg legalises euthanasia.
2 April – Luxembourg is included on a G-20 'grey list' of tax havens.
21 April – Jean-Claude Juncker delivers his fifteenth State of the Nation address.
27 April – Patrick Santer is appointed to the Council of State, replacing Victor Rod, who resigned on 7 March.
26 April – Andy Schleck wins the Liège–Bastogne–Liège in Belgium, marking the first victory of the classic by a cyclist from Luxembourg in 55 years.
12 May - Arcelor Mittal's annual general meeting is marked by a rioting by up to 1,000 steel-workers, bused in from Belgium and France, in Place des Martyrs.
20 May - Luxembourg and the United States sign a tax treaty, pledging to exchange private bank client details upon request: the first Luxembourg has signed with an OECD country.
24 May – The 2008-09 season of the National Division finishes, with F91 Dudelange winning the title for a fifth successive season.
30 May – F91 Dudelange win the Luxembourg Cup, beating UN Käerjéng 97 5-0 in the final to complete the Double for the third time.
2 June - Luxembourg reports its first case of swine influenza in the ongoing pandemic.
7 June – Elections are held to the Chamber of Deputies and to the European Parliament. The CSV wins 26 seats of 60 in the Chamber and 3 of 6 in the European Parliament, strengthening its dominance.
7 June – Fränk Schleck wins the 2009 Tour de Luxembourg, with Team Saxo Bank picking up the team title. He is the first Luxembourger to win since 1983.
22 June - A protest by European milk farmers outside a Council of the European Union meeting in Luxembourg City ends in rioting.
23 July - The CSV and LSAP conclude a coalition agreement, forming a new government under Jean-Claude Juncker and Jean Asselborn.
26 July - The 2009 Tour de France concludes, with Luxembourger Andy Schleck in second place and his older brother Fränk in sixth.
28 July - Laurent Mosar is elected the new President of the Chamber, replacing Lucien Weiler.
11 November – Erna Hennicot-Schoepges is appointed to the Council of State, replacing Nico Edon, who resigned on 1 November.
17 November – Georges Schroeder is appointed as President of the Council of State, replacing Alain Meyer.
11 February - Yvonne Useldinger, politician and resistance leader
2009 in Luxembourg Wikipedia (Text) CC BY-SA
