| Olaf Encke | | 1997 | pencils, ink | | 1 |
| Olaf Enke | | 2001 | pencils, ink | | 1 |
| Olaf Willadsen |  Denmark | 1985 | plot | | 1 |
| Olav Eikeland | | 1975 | plot, script | | 1 |
| Olav Norheim | | 2010 | plot, script | | 1 |
| Olavi Pietikäinen | | 2023 | plot, script, pencils, ink | | 1 |
| Ole Krog | Denmark | 2015 | plot, script | | 1 |
| Ole Peder Giæver | | 2007 | plot, script | | 1 |
| Ole Winding | | 2000 | plot, script | | 1 |
| Olga Turpeinen | | 2021 | plot, script, pencils, ink | | 1 |
| Oliver Hönig | | 1987 | plot, script | | 1 |
| Oliver Jämsä | | 2023 | pencils, ink | | 1 |
| Oliver Maunuksela | | 2023 | pencils, ink | | 1 |
| Olivia Aro | | 2021 | plot, script, pencils, ink | | 1 |
| Olivia Eskola | | 2023 | plot, script, pencils, ink | | 1 |
| Olivia Maaranen | | 2021 | plot, script, pencils, ink | | 1 |
| Olivia Salmelin | | 2023 | pencils, ink | | 1 |
| Olivia Vänskä | | 2023 | pencils, ink | | 1 |
| Olivier Dutto | | 2006 | pencils, ink | | 1 |
| Olivier Frasier | | 2021 | pencils, ink | | 1 |
| Olivier Gesbaud | | 1987 | plot, script, pencils, ink | | 1 |
| Olivier Toublan | | 1999 | plot, script | | 1 |
| Olli Rehn | | 2011 | plot, script | | 1 |
| Olli Rossi | | 2021 | plot, script, pencils, ink | | 1 |
| Olli Saira | | 2023 | plot, script | | 1 |
| Olli Ukkola | | 2023 | pencils, ink | | 1 |
| Olycom | | 2010 | pencils, ink | | 1 |
| Omaar-El-Raumi | | 1935 | plot, script | | 1 |
| Omar Aranda |  Argentina | 1999 | pencils, ink | | 1 |
| Onni Kannala | | 2021 | pencils, ink | | 1 |
| Onni Mustonen | | 2018 | plot, script | | 1 |
| Onni Peltola | | 2023 | pencils, ink | | 1 |
| Oona Arra | | 2021 | plot, script, pencils, ink | | 1 |
| Oona Astala | | 2023 | pencils, ink | | 1 |
| Oppfinnar-Jocke | | 2001 | plot, script | | 1 |
| Oprah Casseys |  United States | 1995 | plot, script | | 1 |
| Orazio Minneci | | 2004 | plot, script | | 1 |
| Oreste Del Buono | | 1969 | plot, script | | 1 |
| Orestes Bernadello | | 2002 | plot, script | | 1 |
| Orestix | | 2020 | pencils, ink | | 1 |
| Orhan Tolon |  Turkey | 1936 | pencils, ink | | 1 |
| Orlando de La Paz | | 1996 | pencils | | 1 |
| Orm Punainen | | 2006 | plot, script | | 1 |
| Oronzo Cilli | | 2024 | plot, script | | 1 |
| Oscar Scalco | | 2007 | ink | | 1 |
| Oscar Valenti | Argentina | 1992 | ink | | 1 |
| Oscar Yichen | | 2026 | pencils, ink | | 1 |
| Oskar Erland Fossaas |  Norway | 2014 | script | | 1 |
| Oskari Ropponen | | 1999 | plot, script | | 1 |
| Osla Nist | | 1935 | plot, script | | 1 |
| Osmo Salonen | | 2021 | pencils, ink | | 1 |
| Ossa Di Pesce | | 2020 | pencils, ink | | 1 |
| Ossi 9 v | | 2024 | pencils, ink | | 1 |
| Ossi Heiter | | 1992 | plot, script | | 1 |
| Osvari | | 2000 | plot, script, pencils, ink | | 1 |
| Oswaldo Storni | | 1938 | pencils | | 1 |
| Otso Alanne | | 2023 | pencils, ink | | 1 |
| Otso Varsaluoma | | 2023 | pencils, ink | | 1 |
| Otto Gabos | | 2014 | plot, script, pencils, ink | | 1 |
| Otto Sjöberg | | 1990 | plot, script | | 1 |
Oscar Martin
96 works, 1988–2024
Vito Stabile
193 works, 2011–2026
Ottavio Panaro
Mike DeCarlo
Marco Nucci