| Acronym | Definition |
|---|
| OW | Overwatch (game) |
| OW | Office of Water |
| OW | Old Welsh |
| OW | Overweight |
| OW | One Way |
| OW | Oscar Wilde (poet) |
| OW | Obwalden (Swiss Half Canton) |
| OW | Oh Well |
| OW | Oprah Winfrey |
| OW | Oneworld (Airline Alliance) |
| OW | Ontario Works |
| OW | Old World |
| OW | Other Woman |
| OW | Outdoor World |
| OW | Outer Worlds |
| OW | Oddworld |
| OW | Openwave (mobile phone browser) |
| OW | Outer Wing |
| OW | Olathe West (high school; Olathe, KS) |
| OW | Optical Window |
| OW | Open Wire |
| OW | Outwar (game) |
| OW | Ordinary Wave |
| OW | Obstacle Warning |
| OW | Old Wycliffian (Wycliffe College; UK) |
| OW | Order-Wire |
| OW | Optical Warning |
| OW | Operating Wing |
| OW | Overwriting Virus (virus scanners) |
| OW | Only Widening |
| OW | Oil-Immersed Water-Cooled |
| OW | Open Along Word Lines |