Donald Hugh Henley (born July 22, 1947) is an American musician who is a founding member of the rock band Eagles, for whom he is the drummer and co-lead vocalist, as well as the sole continuous member of the band. Henley sang the lead vocals on Eagles songs such as "Witchy Woman", "Desperado", "Best of My Love", "One of These Nights", "Hotel California", "Life in the Fast Lane", "Victim of Love", "The Last Resort", "The Long Run", and "Get Over It".

After the Eagles disbanded in 1980, Henley pursued a solo career and released his debut studio album I Can't Stand Still, in 1982. He has released five studio albums, two compilation albums, and one live DVD. His solo tracks include "Dirty Laundry", "The Boys of Summer", "All She Wants to Do Is Dance", "Sunset Grill", "New York Minute", "Not Enough Love in the World", "The End of the Innocence", "The Last Worthless Evening" and "The Heart of the Matter".

The Eagles have sold over 150 million albums worldwide, won six Grammy Awards, had five number one singles, 17 top 40 singles, and six number one albums. They were inducted into the Rock and Roll Hall of Fame in 1998 and are the highest selling American band in history. As a solo artist, Henley has sold over 10 million albums worldwide, had eight top 40 singles, won two Grammy Awards and five MTV Video Music Awards. Combined with the Eagles and as a solo artist, Henley has released 25 top 40 singles on the US Billboard Hot 100. He has also released seven studio albums with the Eagles and five as a solo artist. In 2008, he was ranked as the 87th greatest singer of all time by Rolling Stone magazine.

Henley has also played a founding role in several environmental and political causes, most notably the Walden Woods Project. From 1994 to 2016, he divided his musical activities between the Eagles and his solo career.