P
- Packard
- Packard — U.S.
- Palmer
- Panhard & Levassor
- Parker
- Parodi
- Pegasus Aviation (NZ) Ltd - New Zealand
- Peterlot
- Phillips
- Piaggio-Lycoming (United States and Italy)
- Piaggio — Italy
- Pieper
- Pierce
- Pipe
- Pobjoy Airmotors — UK
- Poinsard
- Polish Engines — Poland
- Porsche
- Potez engines - France
- Power Jets Ltd. — UK
- PowerJet
- Poyer
- Praga - Czech Republic
- Praha-Jinonice — Czech Republic
- Praha-Liben — Czech Republic
- Pratt & Whitney Canada — Canada
- Pratt & Whitney — U.S.
- Pulch
- Pulsar
- PZI — Poland
- PZL — Poland
Read more about this topic: List Of Aircraft Engine Manufacturers