SKZ2021 is the second compilation album by South Korean boy band Stray Kids. It was released digitally on December 23, 2021, through JYP Entertainment. It consists of fourteen tracks that the group had released previously, but re-recorded versions consisting of their current lineup, which were not included in their previous compilation album, SKZ2020 (2020), as well as the Korean version of "Scars", which serves as its lead single.
