One of These Nights is the fourth studio album by the Eagles, released in 1975. In July that year, the record became the Eagles' first number one album on Billboard's album chart, yielding three Top 10 singles: "One of These Nights", "Lyin' Eyes" and "Take It to the Limit". Its title song is the group's second number one single on the Billboard Hot 100. The album sold four million copies and was nominated for Grammy Album of the Year. A single from the album, "Lyin' Eyes", was also nominated for Record of the Year, and won the Eagles' first Grammy for Best Pop Performance by a Duo or Group with Vocals.

One of These Nights is the last Eagles album to feature the original lineup of Randy Meisner, Glenn Frey, Don Henley, and Bernie Leadon (along with then-new member Don Felder). Leadon left the band after the One of These Nights tour due to his dissatisfaction with their shift from country towards a more mainstream rock sound, and was replaced by Joe Walsh. The seventh track, "Visions", is the only Eagles song on which lead guitarist Don Felder sang the lead vocals, despite his desire to write and sing more songs. The album was the band's commercial breakthrough, transforming them into international superstars. They went on a worldwide tour to promote the album.