2521 commonly refers to Twenty-Five Twenty-One () is a 2022 South Korean TV drama

2521, 25/21, 25-21, may also refer to:

2521 (number), a number in the 2000s range A star number 2521, a year in the 3rd millennium 2521 BC, a year in the 3rd millennium Before the Common Era

Places 2521 Heidi, asteroid #2521, a main-belt asteroid Farm to Market Road 2521 (highway 2521), Texas, USA

Other uses

, a World War II Type XXI U-boat Matthew 25:21, a passage in the Christian Bible

See also

2520 (number)