| Orling, O. | O. Orling (O. Orling) | Designer | 1895 | 2 | |
| Orling, E. | E. Orling (E. Orling) | Designer | 1895 - 1896 | 6 | |
| og Bauer, Breitner | Breitner og Bauer (Breitner og Bauer) | Designer | 1897 | 1 | |
| Obstfelder, Helmut | Helmut Obstfelder (Helmut Obstfelder) | Designer | 1949 | 1 | |
| Okada, Saburonosuke | Saburonosuke Okada (Saburonosuke Okada) | Designer | 1909 | 1 | |
| Opperud, Knut | Knut Opperud (Knut Opperud) | Designer | 1994 | 1 | |
| Opstad, Eva Cathrine | Eva Cathrine Opstad (Eva Cathrine Opstad) | Designer | 2007 | 1 | |
| Obolensky, Chloé | Chloé Obolensky (Chloé Obolensky) | Designer | 2011 | 1 | |
| Otto, Bailey | Bailey Otto | Designer | 2014 | 1 | |
| Odvárková, Lenka | Lenka Odvárková | Designer | 2009 - 2011 | 3 | |
| O'Hara, Caitlin | Caitlin O'Hara | Designer | 2013 | 1 | |
| Olson, Stephan | Stephan Olson | Designer | 1990 | 1 | |
| O´Byrne, Louis | Louis O´Byrne | Designer | 1991 | 1 | |
| Ormerod, Nick | Nick Ormerod | Designer | 1990 | 1 | |
| Okazaki, Shinobu | Shinobu Okazaki | Designer | 1991 | 1 | |
| Oskam, Floor | Floor Oskam | Designer | 1991 - 1992 | 14 | |
| O'Connor, Francis | Francis O'Connor | Designer | 2000 | 1 | |
| Oman, Julia, Trevelyan | Julia Trevelyan Oman | Designer | 1980 | 1 | |
| Oldman, David | David Oldman | Designer | 1996 | 1 | |
| Oswald, Cornelius | Cornelius Oswald | Designer | 2014 | 1 | |
| Oliver, Simon | Simon Oliver | Designer | 2002 | 1 | |
| Orcier, Sylvie | Sylvie Orcier | Designer | 2004 - 2005 | 9 | |
| O'Hare, Tim | Tim O'Hare | Designer | 2004 | 1 | |
| Oniga, Laurian | Laurian Oniga | Designer | 1985 | 3 | |
| Ortiz, Alain | Alain Ortiz | Designer | 2006 | 3 | |
| Ogazi, Solomon | Solomon Ogazi | Designer | 2002 | 1 | |
| Ozoliņš, Aigars | Aigars Ozoliņš | Designer | 2008 | 1 | |
| Otto, Max Julian | Max Julian Otto | Designer | 2008 - 2009 | 4 | |
| Onegin, Andrei | Andrei Onegin | Designer | 2009 | 1 | |
| Ogden, James | James Ogden | Designer | 2009 | 1 | |
| Orwig, Katie | Katie Orwig | Designer | 2011 | 1 | |
| O'Mahony, Paul | Paul O'Mahony | Designer | 2013 - 2017 | 3 | |
| Olsen, Jens-Anker | Jens-Anker Olsen | Designer | 1954 - 1956 | 2 | |
| Owen, Tony | Tony Owen | Designer | 2013 | 1 | |
| Ockermüller, Heinz | Heinz Ockermüller | Designer | 1953 | 1 | |
| Okazaki, Koji | Koji Okazaki | Designer | 1999 | 1 | |
| Opgaard, Alen | Alen Opgaard | Designer | 1939 | 1 | |
| Opgaard, Gustav | Gustav Opgaard | Designer | 1939 | 1 | |
| O'Neil, Randall | Randall O'Neil | Designer | 1948 | 1 | |
| Orfanidis, Stelios | Stelios Orfanidis | Designer | 1949 | 1 | |
| O'Nians, Honor | Honor O'Nians | Designer | 1945 - 1946 | 2 | |
| Orlowicz, Tadeusz | Tadeusz Orlowicz | Designer | 1964 | 1 | |
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