| Invention or discovery | Inventor or discoverer | Type |
|---|---|---|
| Cyme laeta | Noortje Looijenga | taxon |
| FORCEDENTRY | Citizen Lab | exploit |
| C/2021 A1 (Leonard) | Gregory J. Leonard | non-periodic comet |
| 2021 AV7 | Alain Maury | near-Earth asteroid |
| 2021 DR15 | Scott S. Sheppard | asteroid |
| Mate Grande | University of Chile | caldera |
| Giant Arc | Alexia Lopez | galaxy filament |
| C/2021 O3 (PanSTARRS) | Pan-STARRS | hyperbolic comet |
| 2021 PH27 | Scott S. Sheppard | near-Earth asteroid |
| C/2021 T4 | Mount Lemmon Survey | hyperbolic comet |
| PwnKit | Qualys | named vulnerability |
| Log4Shell | Alibaba Cloud | named vulnerability |
| Odontonia kerangcaris | Mike Groenhof | taxon |