1980 (MCMLXXX) was a leap year starting on Tuesday of the Gregorian calendar.
January
- January 5: "Spirits (Having Flown)" enters the UK charts
- January 12: Greatest reaches No. 1 on the US charts
February
- February 25: Greatest is certified platinum in the US
March
- March 14: Andy Gibb hosts The Midnight Special
- March 29: Ronald Selle sues the Bee Gees for copyright infringement on "How Deep Is Your Love"
April
- April 11: Andy Gibb performs "Desire" on The Midnight Special
May
- May 7: The album After Dark is certified gold in the US
- May 22: Molly Gibb files for divorce
July
- July 2: Samantha Gibb is born
August
- August 29: The single "Woman In Love" is released
October
- October 2: Bee Gees sue Robert Stigwood
- October 25: "Woman In Love" reaches No. 1 in the US and UK
- October 27: Robert Stigwood sues the Bee Gees for libel
November
- November 7: The single "Woman In Love" is certified gold in the US
- November 15: "Woman In Love" reaches No. 1 in Australia
- November 19: The album Guilty is certified gold and platinum in the US
- November 29: "Woman In Love" reaches No. 1 in South Africa