| RELEASE DATE | ARTIST NAME | ALBUM TITLE | GENRE | REVIEW LINK |
| December 1, 2021 | Luna Fawn Ripley | Deranged Queen | Progressive Metal | |
| December 1, 2021 | Blackhearth | The Wrath of God | Progressive Metal | |
| December 1, 2021 | Сергей Маврин | Иди и смотри | Progressive Metal | |
| December 2, 2021 | Castaway | Everflowing Past EP | Progressive Metal | |
| December 3, 2021 | Beyond Martian Skies | N2H4 | Progressive Metal | |
| December 3, 2021 | Dream Theater | Lost Not Forgotten Archives: When Dream and Day Reunite (Live) | Progressive Metal | |
| December 3, 2021 | Devin Townsend | Snuggles | Progressive Metal | |
| December 3, 2021 | Devin Townsend | The Puzzle | Progressive Metal, Ambient | |
| December 3, 2021 | Ashbreather | Ow, My Eye EP | Progressive Metal | |
| December 3, 2021 | Pantheist | Closer to God | Progressive Doom Metal | |
| December 4, 2021 | Undertime | The Sound of Hope | Progressive Metal | |
| December 5, 2021 | Michael Hanna | A Connection to Eternity | Progressive Metal | |
| December 7, 2021 | Stone Merrick | Ruler of the Seas | Progressive Metal | |
| December 9, 2021 | Domić | The Ancient Lie | Progressive Metal | |
| December 9, 2021 | Novere | Soulless Elements EP | Progressive Metal | |
| December 10, 2021 | Pyramid | Validity | Progressive Metal | |
| December 10, 2021 | Snarled | Kralj Gora | Progressive Metal | |
| December 10, 2021 | Sgàile | Ideals & Morality | Progressive Metal | |
| December 10, 2021 | Noekk | The White Lady | Progressive/Doom Metal | |
| December 12, 2021 | Static Limit | Existentia | Progressive Metal | |
| December 14, 2021 | Kra3tor | TRI EP | Progressive Metal, Electronic | |
| December 16, 2021 | He Was a God | The Smile & The Scar EP | Progressive Metal | |
| December 17, 2021 | Age of Athena | Gate to Oblivion | Symphonic/Progressive Metal | |
| December 17, 2021 | Flashing Thunder | Crazy Strike | Progressive Metal | |
| December 17, 2021 | Lotrify | Time Fracture | Progressive Metal | |
| December 18, 2021 | My Own Black | Songs of Disappearance EP | Progressive Metal | |
| December 20, 2021 | Amyr Abadawn | The New Chapter | Symphonic/Progressive Metal | |
| December 20, 2021 | Syrek | Story | Progressive Metal/Shred | |
| December 26, 2021 | Kopfwerk | Zukunft der Vergangenheit EP | Experimental/Progressive Metal | |
| December 28, 2021 | The Jaxx | New World | Progressive Metal | |
| December 28, 2021 | [Saint] | Camelot I | Symphonic/Progressive Metal | |
| December 29, 2021 | Mirthless | Late December Blossomed Flower | Doom/Progressive Metal | |
| December 31, 2021 | Cyrax | Metamorphosis EP | Progressive Metal |
