"Goodbye" is the eighth single released by the Italian singer Alexia released in 1999 and the first single from her third album Happy. It was the first of Alexia's releases after her switch from the Sony Dancepool label to the Epic label.
The track was initially released in Italy on maxi CD, 2 track CD and 12" (Sony Code 667562) on the Dancepool label before being released across mainland Europe. A remix release later came out in Italy on 12" (Sony Code 668157) on the Epic label, the first of Alexia's releases on the Sony subsidiary for which all of Alexia's future releases would be issued by.
Promotional copies were issued in the UK on Dancepool for a release in October 1999 (Sony Code 6683462), along with an extra remix by the Sharp Boys, but the release date got pushed further and further back. The track went unreleased, despite later plans by Dancepool to issue it as a double A side in the UK with Alexia's next single "Happy". Goodbye was later released in Australia on the Epic label (Sony Code 667562).