2015 (MMXV) is the current year, and is a common year starting on Thursday of the Gregorian calendar (dominical letter D), the 2015th year of the Common Era (CE) and Anno Domini (AD) designations, the 15th year of the 3rd millennium, the 15th year of the 21st century, and the 6th year of the 2010s decade.

2015 has been designated the International Year of Light and the International Year of Soils by the sixty-eighth session of the United Nations General Assembly.

• January 1
  • The Eurasian Economic Union comes into effect, creating a political and economic union between Russia, Belarus, Armenia, Kazakhstan and Kyrgyzstan.
  • Lithuania officially adopts the euro as its currency, replacing the litas, and becomes the nineteenth Eurozone country.
• January 3–7 – A series of massacres in Baga, Nigeria and surrounding villages by Boko Haram killed more than 2000 people.
• January 15 – The Swiss National Bank abandons the cap on the franc''s value relative to the euro, causing turmoil in international financial markets.
• January 22 – After Houthi forces seize the presidential palace, Yemeni President Abd Rabbuh Mansur Hadi resigns after months of unrest.

• NASA''s Dawn spacecraft is expected to arrive at the dwarf planet Ceres.

• May 1–October 31 – Expo 2015 will be held in Milan, Italy.

• July – The ESA and NASA plan to launch the LISA Pathfinder spacecraft, a gravity research probe and technology testbed.
• July 14 – NASA''s New Horizons spacecraft is expected to fly by Pluto and Charon and explore the area for five months, until the distance becomes too great. New Horizons will then enter the Kuiper belt and eventually leave the Solar System.

• The United States and South Korea will dissolve the post-Korean War Combined Forces Command.

• January 1
  • Ulrich Beck, German sociologist (b. 1944)
  • Mario Cuomo, American politician (b. 1932)
  • Omar Karami, 58th Prime Minister of Lebanon (b. 1934)
  • Boris Morukov, Russian astronaut (b. 1950)
• January 3 – Edward Brooke, American politician (b. 1919)
• January 4 – Pino Daniele, Italian singer, songwriter, and guitarist (b. 1955)
• January 5 – Jean-Pierre Beltoise, French race car driver (b. 1937)
• January 6 – Vlastimil Bubník, Czech ice hockey player and footballer (b. 1931)
• January 7
  • Tadeusz Konwicki, Polish writer and film director (b. 1926)
  • Rod Taylor, Australian actor (b. 1930)
• January 8 – Andraé Crouch, American singer, songwriter, and pastor (b. 1942)
• January 9 – Józef Oleksy, 7th Prime Minister of Poland (b. 1946)
• January 10 – Francesco Rosi, Italian film director (b. 1922)
• January 11
  • Anita Ekberg, Swedish actress (b. 1931)
  • Jenő Buzánszky, Hungarian footballer (b. 1925)
• January 12 – Elena Obraztsova, Russian opera singer (b. 1939)
• January 17 – Faten Hamama, Egyptian actress (b. 1931)
• January 20
  • Edgar Froese, German musician (b. 1944)
  • Hitoshi Saito, Japanese judoka (b. 1961)
• January 21 – Leon Brittan, British politician (b. 1939)
• January 23 – King Abdullah of Saudi Arabia (b. 1924)
• January 24 – Otto Carius, German WWII tank commander (b. 1922)
• January 25 – Demis Roussos, Greek singer (b. 1946)

• Back to the Future Part II (1989): Dr. Emmett Brown, Marty McFly and Jennifer Parker time-travel to October 21 of this year, the latest date in the Back to the Future trilogy.