January - April 1965
 | January 4 - United States President Lyndon Johnson proclaims his "Great Society" during his State of the Union address. |
| January 26 - Hindi becomes the official language of India. |
| February 9 - Vietnam War: The first United States combat troops are sent to South Vietnam |
| February 15 - A new red and white maple leaf design is adopted as the flag of Canada replacing the old Red Ensign standard. |
| February 18 - The Gambia becomes independent from the United Kingdom |
| February 20 - Ranger 8 crashes into the moon after a successful mission of photographing possible landing sites for the Apollo program astronauts. |
| February 21 - Malcolm X is assassinated at his mosque in New York City by Black Muslims. |
| March 7 - Bloody Sunday in Selma, Alabama |
| March 8 - Vietnam War: 3,500 United States Marines arrive in South Vietnam becoming the first American combat troops in Vietnam. |
| March 18 - cosmonaut Aleksei Leonov becomes the first person to walk in space from spacecraft Voskhod 2 |
| March 21 - Ranger program: NASA launches Ranger 9 which is the last in a series of unmanned lunar space probes. |
| March 23 - NASA launches Gemini 3 which is the United States' first two-person space flight took (crew: Gus Grissom and John Young). |
| March 25 - Civil rights activists led by Martin Luther King, Jr begin march from Selma to the capitol in Montgomery. |
| April 24 - Fighting breaks out in the Dominican Republic as officers loyal to deposed President Juan Bosch lead a mutiny against the right wing junta running the country. US troops are later sent by President Lyndon B. Johnson for the stated purpose of protecting US citizens and preventing an alleged Communist takeover of the country. |
| April 28 - Vietnam War:
Australian Prime Minister Robert Menzies announces that the country will
substantially increase its number of troops in South Vietnam, supposedly at
the request of the Saigon government, although it is later revealed that
Menzies had asked the leadership in Saigon to send the request at the behest
of the Americans.
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