The December 2021 New Year's Smash was the second New Year's Smash professional wrestling television special produced by All Elite Wrestling (AEW). It took place on December 29, 2021, at Daily's Place in Jacksonville, Florida. The two-part event was broadcast on TNT as special episodes of AEW's weekly television programs, Wednesday Night Dynamite and Friday Night Rampage. Dynamite aired live while Rampage aired on tape delay on December 31. It was the second New Year's Smash event to be held in 2021, after the first took place in January. The Dynamite broadcast was the show's final episode on TNT as Dynamite moved to TNT's sister channel TBS on January 5, 2022.