2007 (MMVII) was a common year starting on Monday of the Gregorian calendar in the 21st century.

2007 was designated as:

• International Heliophysical Year.
• International Polar Year.
• European Year of Equal Opportunities for All.
• Year of Rumi.
• Year of the Dolphin.
• Scotland's Year of Highland Culture.
• Scouting Centenary, celebrating 100 years of the Scout Movement.

UNESCO has recognized fifteen anniversaries for 2007.

January

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• January 1

Bulgaria and Romania join the European Union.

Slovenia adopts the Euro as its official currency, replacing the tolar.

South Korea's Ban Ki-moon becomes the new United Nations Secretary-General, replacing Kofi Annan.

Smoking is banned in all public places in Hong Kong.

Adam Air Flight 574, a routine domestic flight in Indonesia, disappears; debris is found 10 days later, but the aircraft remains missing.

Angola joins OPEC.

War in Somalia: Fighters of the Islamic Courts Union abandon their last stronghold in Kismayo and flee for the Kenyan border.

• January 2 – The new constitution of Gibraltar comes into force.
• January 3 – China conducts an anti-terror raid in Xinjiang.
• January 4 – Nancy Pelosi becomes the first female Speaker of the United States House of Representatives.
• January 5 – War in Somalia: The first shots are fired in the Battle of Ras Kamboni.
• January 8

Daniel Ortega becomes President of Nicaragua for the second time.

Russian oil supplies to Poland, Germany, and Ukraine are cut as the Russia-Belarus energy dispute escalates; they are restored 3 days later.

• January 9

War in Somalia: U.S. planes conduct air strikes in Somalia against suspected terrorists.

An AerianTur-M Antonov An-26 crashes in Balad, Iraq; the Islamic Army in Iraq claims to have shot it down.

Apple Inc. announces and introduces the highly speculated iPhone at the 2007 Macworld Conference & Expo.

• January 10 – President of the United States George W. Bush announces a plan to station 21,500 additional troops in Iraq.
• January 11

In Bangladesh, a state of emergency is declared by caretaker President Iajuddin Ahmed, following weeks of violent protests preceding upcoming parliamentary elections.

Vietnam joins the World Trade Organization as its 150th member.

China successfully tests a ground-based ballistic missile capable of destroying satellites in orbit, drawing criticisms from other countries.

• January 12

An Argentine judge issues a warrant for the arrest of former President Isabel Martínez de Perón, in connection with the disappearance of a human rights worker in 1976.