The Nigerian coup is overturned by another faction of the military, leaving a military government in power. This is the beginning of a long period of military rule.
Carl Brashear, the first African-American United States Navy diver, is involved in an accident during the recovery of a lost H-bomb which results in the amputation of his leg.
The British government promises the U.S. that British troops in Malaysia will stay until more peaceful conditions occur in the region.
Britain's Labour Party unexpectedly retains the parliamentary seat of Hull North in a by-election, with a swing of 4.5% to their candidate from the opposition Conservatives, and a majority up from 1,181 at the 1964 General Election to 5,351.
January 29 – The first of 608 performances of Sweet Charity opens at the Palace Theatre in New York City.