Marvel
| Series | Years | Runs | On disk | Missing |
|---|---|---|---|---|
| Obnoxio the Clown | 1983 | 1 | 1 | – |
| The Official Handbook of the Marvel Universe: Master Edition | 1990 | 1 | 36 | – |
| Old Man Hawkeye | 2018 | 1 | 12 | – |
| Old Man Logan · 1 annual run | 2016–2018 | 1 | 51 | – |
| Omega Flight | 2007 | 1 | 5 | – |
| Omega Kids | 2025 | 1 | 3 | – |
| One World Under Doom | 2025 | 1 | 9 | – |
| Onslaught: Marvel | 1996 | 1 | 1 | – |
| Osborn: Evil Incarcerated · 1 collected | 2011 | 0 | 0 | – |