| Oriental Empires | Iceberg | 5/10 | |
| Original Journey | Another Indie | 5/10 | |
| Osu! Tatakae! Ouendan | Nintendo | 9/10 | |
| Othello | Arc System Works | 6/10 | |
| Othercide | Focus Home | 6/10 | |
| Out of Ammo | Zen | 2/10 | |
| Out of Order | Hungry Software | 8/10 | |
| Out Run | SEGA | 8/10 | |
| Out There: Omega Edition | Mi-Clos Studio | 5/10 | |
| Outbreak: The New Nightmare | Dead Drop Studios LLC | 2/10 | |
| OUTBUDDIES | Headup | 6/10 | |
| Outer Wilds | Annapurna | 5/10 | |
| Outland | Housemarque | 8/10 | |
| Outlast 2 | Red Barrels | 5/10 | |
| Outlast 2 | Red Barrels | 6/10 | |
| Outlast: Bundle of Terror | Red Barrels | 7/10 | |
| Outriders | Square Enix | 5/10 | |
| Outward | Deep Silver | 4/10 | |
| Overcooked | Team17 | 8/10 | |
| Overcooked | Team17 | 8/10 | |
| Overcooked! 2 | Team17 | 8/10 | |
| Overcooked! 2 – Surf 'n' Turf | Team17 | 7/10 | |
| Overcooked! All You Can Eat | Team17 | 9/10 | |
| Overcooked! Special Edition | Team17 | 6/10 | |
| Overcooked: The Lost Morsel | Team17 | 7/10 | |
| Overfall | Pera Games | 7/10 | |
| Overgrowth | Wolfire | 6/10 | |
| Overlord: Minions | Codemasters | 7/10 | |
| Overpass | Nacon | 5/10 | |
| Overwatch | Blizzard | 8/10 | |
| Owlboy | D-Pad Studio | 7/10 | |