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- El obispo leproso (TVE, 1990) Miniseries of 6 episodes of 60 minutes. Based on two novels by Gabriel Miró.
- Obsesión (TVE, 2005) 125 episodes of 50 minutes. Soap opera.
- Oh! Espanya (TV3, 1996) 17 episodes of 30 minutes. A group of Catalan tourists made surrealist travels across different communities of Spain. Sequel of Oh! Europa. Catalan.
- Oh! Europa (TV3, 1996) 13 episodes of 30 minutes. A group of Catalan tourists made surrealist travels across different countries of the European Economic Community. Catalan.
- Oliana Molls i l'astàleg de bronze (TV3, 1985–1987) 61 episodes of 30 minutes. Adventures of a Catalan archaeologist. Catalan.
- El olivar de Atocha (TVE, 1988) 26 episodes of 60 minutes. Family saga from 1898 to 1988.
- Original (TVE, 1974–1977) 48 episodes of 60 minutes. Drama unfolding at different times in the history of Spain.
- Operación Malaya (TVE, 2011) Miniseries of 2 episodes. Series about the corruption case Operation Malaya.
- Operación Jaque (TVE, 2011) Miniseries of 2 episodes. About the hostage liberation of Colombian politician Íngrid Betancourt.
- Oro verde (Antena 3, 1992) 65 episodes of 60 minutes. History of a rich olive producer of Jaén.
- Otoño romántico (TVE, 1973–1974) 13 episodes of 50 minutes. Romantic drama.
- La otra cara del espejo (TVE, 1965) 8 episodes of 50 minutes. Drama
Read more about this topic: List Of Spanish Television Series