1021 (MXXI) is a number in the 1000's number range.
1021 or variation may also refer to:
- 1021 CE, A.D. 1021, the 1021st year of the Common Era
- 1021 BCE, 1021 B.C., the 1021st year before the Common Era
- 1021 Flammario, the 1021st asteroid catalogued
- Objects by number
- USS Courtney (DE-1021), US Navy destroyer escort #1021
- German submarine U-1021, Nazi Germany Kriegsmarine U-boat #1021
- Falcon 9 booster B1021, SpaceX Falcon 9 first stage booster core #1021
- Farman F.1021, an experimental aircraft from 1930s France
- Other uses
- Code page 1021 (CH7DEC), a computer character set, the Swiss variant of DEC's National Replacement Character Set (NRCS)
| disambiguation page lists articles associated with the same number.
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