O
- Joost Ockers 2 devices
- Jodocus Olchers 1 device
- Aart Dircksz Oossaan 2 devices
- Daniel Oostendorp 1 device
- Pieter Oosterhout 1 device
- Johannes van Oosterwyk 1 device
- Johannes Oporinus 0 devices
- Printer of the Opus Minus 1 device
- Jan Jansz Orlers 5 devices
- Thomas Willemsz van Orten 1 device
- Peter Os van Breda 7 devices
- Barent Otsz 11 devices