1975 (MCMLXXV) was a common year starting on Wednesday of the Gregorian calendar, the 1975th year of the Common Era (CE) and Anno Domini (AD) designations, the 975th year of the 2nd millennium, the 75th year of the 20th century, and the 6th year of the 1970s decade.

1974 (MCMLXXIV) was a common year starting on Tuesday of the Gregorian calendar, the 1974th year of the Common Era (CE) and Anno Domini (AD) designations, the 974th year of the 2nd millennium, the 74th year of the 20th century, and the 5th year of the 1970s decade.