Obelisk by Herman Ihlenburg for MacKellar, Smiths & Jordan in 1881
Oberon by Phill Grimshaw for Letraset in 1986
Obese by Ed Benguiat for Photo-Lettering Inc. in ca. 1960
Obliq by Ellipsis for Letraset in 1984
Octopuss by Colin Brignall for Letraset in 1970
Odessa by Peter O'Donnell for Letraset in 1988
Odin by Bob Newman for Letraset in 1972
Old Bowery by ATF in 1933
Old English Text in 1935
Old Style by Gustav F. Schroeder for Central Type Foundry in 1886
Old Style Antique No. 7 by Alexander Phemister for Miller & Richard in ca. 1858
Oldgate Lane Outline by Nick Curtis in 2005
Oldenburg by Wim Crouwel in 1970
Olympia by Lance Wyman in 1968
Olympiad Black for VGC
Ondine by Adrian Frutiger for Deberny & Peignot in 1954
Onyx by Gerry Powell for ATF in 1937
Op Letter by Walter Haettenschweiler in 1968
Opaque by by Charles E. Heyer for Barnhart Bros. & Spindler in 1888
Open Capitals Roman by Jan Van Krimpen for Enschedé in 1929
Optex by Michel Waxmann for Letraset in 1970
Optima by Hermann Zapf for Stempel in 1952-1955
Optima Nova by Hermann Zapf, Akira Kobayashi for Linotype in 2002
Opulent by Phil Martin, George Brian for TypeSpectra Inc. in 1975
Or by Andy Song for Hollenstein in 1970
Orator by Leonard H. D. Smit for Amsterdam Type Foundry in 1960
Orbit B by Stan Biggenden for VGC in 1972
Organda by Franz Heigemeir for VGC in 1972
Orlando by Freda Sack for Letraset in 1986
Orpheus by Walter Tiemann for Klingspor in 1926–1928
Ortem by John Howard Crook for Mecanorma
Oscar by François Boltana in 1997
Osprey by Stephen Farrell for T-26 in 1993
Othello by Gustav F. Schroeder for Central Type Foundry in 1892
Othello by Morris Fuller Benton for ATF in 1934
Otto by Non-Format for HypeForType in 2009
Our Bodoni by Tom Carnase, Massimo Vignelli for WTC in 1990
Outline by Kari Lilja for Mecanorma in 1972
Ovidius by Thaddeus Szumilas for Group Type
Oxford by Henry Schuenemann for Cleveland Type Foundry in 1888
Oxford by Christine Lord for Face Photosetting in 1969?