| Name | Description | Year Started | Year Ended |
|---|
| Pacific | Canadian commercial vehicle manufacturer of North Vancouver | 1947 | |
| Packard | American vehicle manufacturer of Warren, Ohio/ Detroit, Michigan | 1899 | 1958 |
| Pagefield | British commercial vehicle marque of Wigan, Lancashire | 1907 | 1955 |
| Palladium | British vehicle manufacturer of London | 1912 | 1925 |
| Panhard-Levassor | French vehicle manufacturer of Paris | 1890 | 1967 |
| Panther | British car manufacturer of Surrey | 1972 | 1996 |
| Peerless | British car manufacturer of Slough, Buckinghamshire | 1957 | 1960 |
| Peerless | British car manufacturer of Slough, Buckinghamshire | 1957 | 1960 |
| Pegaso | Spanish vehicle marque of Barcelona | 1949 | |
| Perodua | Malaysian car manufacturer of Serendah | 1994 | |
| Peterbilt | American commercial vehicle manufacturer of Oakland, Newark and Denton | 1939 | |
| Peugeot | French vehicle manufacturer of Valentigney/Audincourt/ Paris | 1890 | |
| Piaggio | Italian vehicle manufacturer of Genoa | 1946 | |
| Pierce-Arrow | American vehicle manufacturer of Buffalo, New York | 1901 | 1938 |
| Pinin Farina | Italian coach builder of Turin | 1930 | |
| Plymouth | American vehicle marque of Detroit, Michigan | 1928 | |
| Pontiac | American vehicle manufacturer of Pontiac, Michigan | 1926 | |
| Porsche | German car manufacturer of Gmund/Stuttgart | 1948 | |
| Princess | British car marque of Longbridge | 1975 | 1982 |
| Proton | Malaysian vehicle manufacturer of Selangor | 1985 | |
