Donald Hugh Henley is an American musician, singer, songwriter, record producer and founding member of the Eagles. He was the drummer and co-lead vocalist for the Eagles from 1971 until the band broke up in 1980, and has reprised those duties for the group's reunions since 1994. He has been the only constant member of the band since its formation. Henley sang the lead vocals on Eagles hits such as "Witchy Woman", "Desperado", "Best of My Love", "One of These Nights", "Hotel California", "Life in the Fast Lane", "The Long Run" and "Get Over It".

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

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 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.