Once in a Lifetime is a live album by Scottish Celtic rock band Runrig.

It was released in 1988.

A review from AllMusic called it one of the best live albums ever: "Capturing the band in its best milieu – live – Once in a Lifetime is arguably one of the ten best live albums ever, if the test of a live album is the effect a band has on its audience that particular night.

Alternately exhilarating and soul-stirring, its highlight is a rendition of "Loch Lomond" that has to be heard to be believed.

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