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O-On
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O'Connell USA 1928 n/a
Oakland USA 1907 1932 USA Oakland Motor Car Co. Pontiac, Michigan
OBC SWE 1969 1974 O. Beckmann Cars AB (one prototype build)
Ockelbo SWE 1957 1965 L. Gustafsson & E. Lundgren
OD/Owner Driver GB 1921 OD Cars Ltd., Belfast
Odetti IT 1922 1925 n/a
Offenhauser USA 1934 n/a
Ogle GB 1959 1963 n/a
Ogren USA 1914 1922 Ogren M. C. Co., Chicago Ill.
OHB GB 1903 O'Halloran Brothers. n/a
Ohio USA 1909 1915 Ohio M. C. Co., Cincinnati O.
Ohio Electric USA 1909 1915 Ohio Elec. Car. Co., Toledo Oh.
Oka RUS 1988 now M. Djalilya prospect, Naberezhnye Chelny, Tatarstan
Okey USA 1906 1908 Okey M. C. Co. Columbus O.
Old Mill GB 1914 1916 Albert Lambourne Ltd., Millworks, Brighton, Sussex
Old Reliable USA 1926 n/a
Oldfield USA 1924 n/a
Olds USA 1897 1908 Olds Motor Vehicle Co. GM since 1908
Oldsmobile USA 1908 now General Motors, Oldsmobile Division, Lansing, Mich.
Oldsmobile 4dr (1937)
Oliver USA 1935 n/a
Olsson SWE 1903 J. Olsson, Göteborg (one home-build car)
Oltcit ROM 1977 now n/a
Oltcit Club 11R (1982)
Olympian USA 1916 1920 Olympian Ms. Co. Pontiac Mich.
Olympic USA 1922 n/a
O.M. IT 1918 1933 Officine Meccaniche SA., Brescia
Omega GB 1925 1927 WJ Green Ltd., Coventry
Omega-Six FR 1922 1930 n/a
Omort USA 1927 n/a
OMT IT 1907 1913 n/a
Only USA 1910 1913 Only Car Co. Port Jefferson N.Y.
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Op-Ox
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Opel DU 1898 now Adam Opel AG., Rüsselheim. GM since 1931.
Opel GT (1973)
Opel Vectra (2002)
Opes IT 1946 1948 n/a
Opperman GB 1898 1907 n/a
Opperman GB 1956 1959 S.E.Opperman Ltd., Borehamwood, Hertfordshire
Orient USA 1900 1905 Waltham Mfg. Co., Waltham Mass.
Orient Express DU 1898 n/a
Oriole USA 1927 n/a
Orion GB 1914 n/a
Orleans USA 1920 n/a
Orpington GB 1920 1924 Smith & Milroy Ltd., Orpington, Kent
Orsa SWE 1920 G. Pettersson, Orsa (one home-build car)
Orson USA 1910 1913 Orson Auto. Co., New York N.Y.
Osca IT 1947 1966 Automobili OSCA, Fratelli Maserati, Bologna
Osca MT4-2AD Barchetta (1952)
Oshkosh USA 1926 n/a
Osi IT 1960 1970 Officine Stampaggi Industriali, Turin
Osterfield GB 1906 1909 Douglas S.Cox, West Norwood, London
Ostermann DU n/a n/a (Kit-car replica)
Otomo JAP 1920 n/a
Otosan TUR 1959 n/a
Otto USA 1900 1912 Otto Gas Engine Wks. Philadelphia Penn.
Ottocar USA 1903 1904 Otto Konigslow, Cleveland O.
Overholt USA 1909 1910 The Overholt Co., Galesburg Ill.
Overland USA 1903 1907 n/a - Willys-Overland since 1907
Overland/
Overland-Crossley/
Willys-Overland/
Willys-Knight GB 1919 1931 Overland-Crossley, Stockport
Owen GB 1899 1932 Automobile Transport Co.Ltd., London
Owen USA 1909 1911 Owen M. C. Co. Lansing Mich.
Owen-Magnetic USA 1914 1920 R. M. Owen & Co., New York N.Y.
Oxford USA 1905 1906 Detroit-Oxford Mfg. Co., Oxford Mich.