| Otonomous Operating System | — | — | — |
| Paipix | — | — | — |
| Paldo GNU/Linux | Jürg Billeter | — | GNU General Public License |
| Parabola GNU/Linux-libre | — | — | GNU General Public License |
| Parch Linux | — | — | GNU General Public License |
| Pardus | TÜBİTAK | — | GNU General Public License |
| Parrot OS | — | — | — |
| Parsix | — | — | — |
| Parted Magic | — | — | GNU General Public License |
| PCLinuxOS | — | — | — |
| PCQ Linux 2005 | — | — | — |
| Pear OS | — | — | — |
| PearOS | — | — | — |
| PelicanHPC | — | — | — |
| Pentoo | — | — | GNU General Public License |
| Peppermint Linux OS | — | — | GNU General Public License |
| PHLAK | — | — | — |
| Phoenix OS | — | — | — |
| PhoeNUX OS | — | — | — |
| Photon OS | — | — | — |
| Pidora | Seneca Polytechnic | 2012 | — |
| Pie Box Enterprise Linux | — | — | — |
| PING | — | — | GNU General Public License |
| Pingo Linux | — | — | — |
| Pinguy OS | — | — | GNU General Public License |
| Piumalinux | — | — | — |
| Pixart | — | — | — |
| Plamo Linux | — | — | — |
| Platypux | — | — | GNU General Public License |
| PLD Linux | — | 1998 | GNU General Public License |
| Pop!_OS | System76 | 2017 | GNU General Public License |
| Porteus | — | — | GNU General Public License |
| Poseidon Linux | — | — | — |
| PowerLinux | IBM | — | — |
| Predator OS | — | — | — |
| PrimTux | — | — | GNU General Public License, version 3.0 |
| Progeny Componentized Linux | Progeny Linux Systems | — | — |
| ProteanOS | — | — | — |
| Proxmox Backup Server | — | — | GNU Affero General Public License, version 3.0 |
| Proxmox Mail Gateway | — | — | — |
| Proxmox Virtual Environment | Proxmox Server Solutions GmbH | — | GNU Affero General Public License, version 3.0 |
| Puavo | — | — | GNU General Public License, version 2.0 |
| PUD | — | — | — |
| PureOS | Purism | — | Creative Commons Attribution-ShareAlike 4.0 International |
| Pyabr | — | — | — |
| Qasedak distro | — | — | — |
| QiLinux | — | — | GNU General Public License |
| Qimo | — | — | — |