A Decade is Canadian alternative rock band Our Lady Peace's first compilation album, released on November 21, 2006, in Canada, and November 28, 2006, in the United States.

The Canadian release of the album includes a bonus DVD containing a feature-length concert/documentary directed by Rafael Ouellet and produced by Robi Levy.

The film features interviews with the current band members, behind the scenes footage, and performances of the songs "Picture", "Thief", "Innocent", "Where Are You", "Wipe That Smile Off Your Face", and "Clumsy" shot on November 6, 2005, at Massey Hall in Toronto.

"In Repair" and "Life" appear with narration from Ray Kurzweil's book The Age of Spiritual Machines, which inspired the album on which the two songs first appeared, Spiritual Machines.

The first single from the album was "Kiss on the Mouth", released in Canada in September 2006.