"Heartache Tonight" is a song written by Don Henley, Glenn Frey, Bob Seger and J. D. Souther, recorded by the Eagles and features Glenn Frey on lead vocals. The track was included on their album The Long Run and released as a single in 1979. It reached No. 1 on the U.S. Billboard Hot 100 in November of that year and was certified Platinum by the Recording Industry Association of America representing one million copies sold. It was the Eagles' final chart-topping song on the Hot 100.

Glenn Lewis Frey was an American musician. He was a founding member of the rock band the Eagles. Frey was the co-lead singer and frontman for the Eagles, roles he came to share with fellow member Don Henley, with whom he wrote most of the Eagles' material. Frey played guitar and keyboards as well as singing lead vocals on songs such as "Take It Easy", "Peaceful Easy Feeling", "Tequila Sunrise", "Already Gone", "James Dean", "Lyin' Eyes", "New Kid in Town", and "Heartache Tonight".