| Map | Title | Author | Players | |
|---|---|---|---|---|
| ONS-EarlyDawn | Early Dawn | Epic Games | Unknown | |
| ONS-ECE-Doomed | Doomed | Mark 'Kalamity' Walker | 10-20 | |
| ONS-Echo-100 | Echo | slinky | 12-24 | |
| ONS-Echo-101 | Echo | slinky | 12-24 | |
| ONS-Echo-102 | Echo | slinky | 12-24 | |
| ONS-Eire | Eire | Callum "Spiff" Ogden | 4 | |
| ons-escalade_night | ONS-Escalade night | Alaney3 | 14-24 | |
| ONS-Evergreen | ONS-Evergreen | Sergeant_Rommel | Unknown | |
| ONS-Evergreen | Evergreen | Scott \"Uberscheisse\" Larson | 16-32 | |
| ONS-EvilMood | EvilMood | ~s'na | 8-16 |