L.E.F. is a dance and electro album released by Ferry Corsten in May 2006. It was his second studio album that was released under his own name. The word lef also means "guts" in Dutch. The album has spawned six singles. The songs include vocals by Simon Le Bon, Howard Jones, Denise Rivera, Debra Andrew, Guru, and Oz.

Ferry Corsten is a Dutch DJ, record producer and remixer. He is well known for producing many pioneering trance tracks during the 1990s–2000s under his numerous aliases, including System F, Moonman, Pulp Victim and Gouryella. In recent years, he has shifted to a broader electronic music style, playing everything from progressive house to uplifting trance; and hosts his own weekly radio show, Resonation Radio. Corsten routinely plays at events and festivals all over the world including Electric Daisy Carnival, Tomorrowland, and many others, and has been consistently ranked among DJ Mag's Top 100 DJs poll, having placed at rank 5 in 2004 and 2005, 6 in 2006 and 2008; and most recently at 89 for 2023.