January 31 – A total lunar eclipse takes place. The Moon appears as supermoon. It was also referred to as the super blue blood moon.
February 9-25 – The 2018 Winter Olympics are held in Pyeongchang, South Korea. They are followed by the Paralympics from March 9–18..
February 11 – Saratov Airlines Flight 703 crashes shortly after take-off from Moscow, killing 71 people on board.
February 14 – Jacob Zuma resigns as President of South Africa, after nine years in power.
March 4 – Former Russian double agent Sergei Skripal and daughter Yulia are poisoned by the Novichok nerve agent in Salisbury, England.
March 9-18 – The 2018 Winter Paralympics are held in Pyeongchang, South Korea.
March 18 – In the Russian presidential election, Vladimir Putin is elected for a fourth term.
March 19 – The world's last male northern white rhinoceros dies in Kenya, making the subspecies functionally extinct.
April 4-15 – The 2018 Commonwealth Games are held in Gold Coast, Queensland, Australia.
April 30 – The Dominican Republic officially recognizes the People's Republic of China as the sole government of China, cutting ties with Taiwan
May 8 – U.S. President Donald Trump announces his intention to withdraw the United States from the Iranian nuclear agreement.
May 24 – Burkina Faso officially recognizes the People's Republic of China as the sole government of China, cutting ties with Taiwan.
May 8-9 – The 44th G7 summit is held in Canada.
June 12 – The 2018 North Korea–United States summit is held in Singapore. It is the first summit between a United States President and the North Korean leader.
June 14 - July 15 – The 2018 FIFA World Cup is held in Russia.
June 19 – The United States announces it will withdraw from the United Nations Human Rights Council.
June 22 – July 1 – The 2018 Mediterranean Games are held in Tarragona, Spain.
June 24 – Saudi Arabia allows women to drive.
July 5 – The 2018 North Korea–United States summit is held in Singapore. It is the first summit between a United States President and the North Korean leader.
July 9 - Eritrea and Ethiopia officially declare an end to their twenty-year conflict.
July 11-12 – The 2018 Brussels NATO summit is held in Belgium.
July 27 – The longest total lunar eclipse of the 21st century occurs, and Mars makes its closest approach to Earth since 2003.
August 2 – Apple Inc. becomes the world's first public company to achieve a market capitalization of $1 trillion.
August 12 – NASA launches the unmanned Parker Solar Probe to study the Sun at close range and the solar wind.
August 18 - September 2 – The 2018 Asian Games are held in Jakarta and Palembang, Indonesia.
August 23 – Ecuador withdraws from ALBA.
September 5 – The Supreme Court of India decriminalises homosexuality.
October 2 – Washington Post journalist Jamal Khashoggi is murdered inside the Saudi consulate in Istanbul, triggering a diplomatic crisis for Saudi Arabia.
October 27 – Michael D. Higgins is officially declared President of Ireland after receiving 822,566 first preference votes.
October 28 – The far-right Jair Bolsonaro is elected as the next President of Brazil, with 55% of the vote.
October 30 – NASA's Kepler mission ends after the spacecraft runs out of fuel..
November 1 – NASA's Dawn mission concludes after it runs out of hydrazine fuel.
November 4 – New Caledonia holds an independence referendum, with 56.4% voting against independence versus 43.6% in favour.
November 27 – Ukraine declares martial law after an armed incident in which Russia seized three Ukrainian ships in the disputed Kerch Strait.
December 15 – At the Katowice Climate Change Conference, nearly 200 nations agree rules on implementing the 2015 Paris agreement.