1975 (MCMLXXV) was a common year starting on Wednesday of the Gregorian calendar.
January
- January 6: Bee Gees begin recording Main Course
- January 7: "Country Lanes" is recorded
- January 23: "Come on Over" is recorded
- January 30: "Nights on Broadway", "Songbird", and "Edge of the Universe" are recorded
February
- February 2: "Jive Talkin'" is recorded
- February 17: "Wind of Change" is recorded
- February 19: "Fanny (Be Tender With My Love)" is recorded
May
- May: Main Course tour begins in the US
- May: The single "Jive Talkin"/"Winds of Change" is released
- May 30: Concert in Dayton, Ohio
- May 31: "Jive Talkin'" enters the US charts
June
- June: Main Course is released
- June 21: Main Course enters the US charts
- June 28: "Jive Talkin'" enters the UK charts
July
- July 26: "Jive Talkin'" goes No. 1 in Canada
August
- August 9: "Jive Talkin'" goes No. 1 in the US
- August 21: Maurice Gibb and Lulu are legally divorced
- August 21: "Jive Talkin'" is certified gold in the US
- August 21: Bee Gees perform on the Mike Douglas Show
September
- September: The single "Nights on Broadway"/"Edge of the Universe" is released
- September: Barbara Gibb moves back to Australia
- September 12: Bee Gees perform on the Midnight Special - Video
October
- October 5: "Nights on Broadway" enters the US charts
- October 17: Maurice Gibb marries Yvonne Spenceley
November
- November: Andy Gibb releases his first single "Words and music"/"Westfield mansions" in Australia
December
- December 23: Main Course is certified gold in the US
- December 27: "Fanny (Be Tender With My Love)" enters the US charts