2003 has part(s) April 2003
May
May 1
2003 Bingöl earthquake: A 6.4 Mw  earthquake strikes in Bingöl, Turkey, killing 177 people.
U.S. President George W. Bush declares an end to the invasion of Iraq in the Mission Accomplished speech. Hostilities would continue for several years during a period of Iraqi insurgency.
May 11
Benvenuto Cellini's Cellini Salt Cellar table sculpture is stolen from the Kunsthistorisches Museum in Vienna.
Lithuania approves joining the European Union in a referendum.
2003 Sri Lanka cyclone: A cyclone makes landfall in Sri Lanka, killing 260 people and causing the country's worst natural disaster in 50 years.
May 12
In Riyadh, Saudi Arabia, over 30 people are killed in multiple bombings at a housing compound, mostly foreign expatriates.
2003 Znamenskoye suicide bombing: Chechen suicide bombers attack a government office in Znamenskoye, Russia, killing at least 59 people.
May 15 – 2003 Argentine general election: Néstor Kirchner becomes president-elect of Argentina after Carlos Menem withdraws from the runoff election.
May 16 – 2003 Casablanca bombings: Islamist militants affiliated with Al-Qaeda in the Islamic Maghreb carry out a series of suicide bombings in Casablanca, Morocco, killing at least 41 people.
May 17 – Slovakia approves joining the European Union in a referendum.
May 21 – Algeria The 6.8 Mw  Boumerdès earthquake shakes the suburb of the Algerian capital Algiers with a maximum Mercalli intensity of X (Violent), killing an estimated 2,266 people.
May 23 – Dewey, the world's first cloned deer is born, at Texas A&M University.
May 26 – A constitutional referendum is held in Rwanda.
May 28 – Prometea, the world's first cloned horse, is born.
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