PANTHER DIESEL, Milan, Italy, 1954-1955
PANTHER, Weybridge, UK, 1972-1994
PANHARD ET LEVASSOR, Paris, France, 1889-1967
PACKARD, Detroit, USA, 1899-1958
OTAV, Mailand, Italy, 1905-1908
PADUS, Turin, Italy, 1906-1908
AUSTIN HEALEY, Longbridge, UK, 1953-1971
AUSTIN, Longbridge, UK, 1906-1989
OSCA, Bologna/San Lazzaro di Savena, Italy, 1947-1967
Opes, Turin, Italy, 1946-1948
OPEL, Ruesselsheim, Germany, 1898-
OMT, Turin, Italy, 1907-1913
OMEGA-SIX, Boulogne-sur-Seine, France, 1922-1930
OM, Brescia, Italy, 1918-1934
OLDSMOBILE, Lansing/Detroit, USA, 1896-
OAKLAND, Pontiac, USA, 1907-1932
OKA, Naberezhnye Chelny, USSR/Russia, 1988-
ODETTI, Milan, Italy, 1922-1925
AUBURN, Auburn, USA, 1900-1937
NASH, Kenosha, USA, 1917-1957
NSU, Neckarsulm/Heilbronn, Germany, 1905-1929, 1958-1977
NISSAN, Tokyo/Osaka/Yokohama, Japan, 1912-
ASTER INALIANA, Milan, Italy, 1906-1908
Asquith Motor Company Ltd, England.
Asia Rocsta