The second season of The Sing-Off premiered on December 6, 2010. The number of a cappella groups was increased from 8 to 10, with all acts coming from the United States. Nick Lachey was kept as host for the new season, and the three judges Ben Folds, Shawn Stockman and Nicole Scherzinger also returned. The program aired for 5 nights in December, and its finale was on December 20, 2010. The season premiere averaged 8.5 million viewers. On the finale, the group Committed became the second champion of the show, beating out Street Corner Symphony, The Backbeats, and Jerry Lawson & Talk of the Town. This was Scherzinger's final season as a judge.

• Shawn Stockman
• Nick Lachey
• Patrick Stump
• Jewel