The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Natur (4 members)
- Nature (2 members)
- Netart (1 member)
- Network (1 member)
- Netze (5 members)
- Netztechnik (27 members)
- Netzwerk (1 member)
- NeuralNetworks (1 member)
- Neuronales Netz (2 members)
- Nicole Wolf (1 member)
- Nähkästchen (1 member)
- OSC (1 member)
- OS X (5 members)
- Objective-C (31 members)
- Olaf Nenninger (1 member)
- OpenStreetMap (1 member)
- Open Frameworks (2 members)
- Ordnung (2 members)
- OutsideMobile, Going Mobile, Exkursion, SS15 (1 member)
- Outside Mobile (4 members)
- PHP (11 members)
- Pablo Silva Saray (4 members)
- Pages using ISBN magic links (9 members)
- Pages with broken file links (19 members)
- Pages with ignored display titles (2 members)
- Pages with syntax highlighting errors (37 members)
- Particle System (1 member)
- Particles (1 member)
- Patterns in Nature (2 members)
- Patterns in Society (2 members)
- Performance (3 members)
- Philosophie (4 members)
- Physical Computing (8 members)
- Pixels (1 member)
- Plugin (4 members)
- Poetry (1 member)
- Printed Electronics (8 members)
- Processing (56 members)
- Programmiersprachen (70 members)
- Programmierung (2 members)
- Programming (7 members)
- Projection Mapping (2 members)
- Projekt (10 members)
- Projektliste (7 members)
- Projektmodul (85 members)
- Projektraum (1 member)
- Prototyping (2 members)
- Pure Data (156 members)
- Python (7 members)
- Ralf Baecker (1 member)