| O archimastoras Solnes, 19831102 | O archimastoras Solnes | 19831102 | 2nd November 1983 | | Theatro Dionysia | Greece | |
| O Construtor, 19931118 | O Construtor | 19931118 | 18th November 1993 | Teatro da Graça | Teatro da Graça | Portugal | |
| O echtros tou laou, 19790507 | O echtros tou laou | 19790507 | 7th May 1979 | ERT TV Channel | ERT TV Channel | Greece | |
| O ehthros tou laou, 19720408 | O ehthros tou laou | 19720408 | 8th April 1972 | Greece | Greece | Greece | |
| O Inimigo do Povo, 19831209 | O Inimigo do Povo | 19831209 | 9th December 1983 | Teatro Cândido Mendes | Teatro Cândido Mendes | Brazil | |
| Oblubienica Morza, 18991230 | Oblubienica Morza | 18991230 | 30th December 1899 | Teatr Miejski | Teatr Miejski | Poland | |
| Oblubienica Morza, 19101119 | Oblubienica Morza | 19101119 | 19th November 1910 | Teatr im. Juliusza Słowackiego | Teatr im. Juliusza Słowackiego | Poland | |
| Oblubienica Morza, 19111018 | Oblubienica Morza | 19111018 | 18th October 1911 | Teatr Miejski | Teatr Miejski | Ukraine | |
| Obsession, 201906 | Obsession | 201906 | June
2019 | YUG Theatre | YUG Theatre | Azerbaijan | |
| Ocaso de un Estafador, El, 20180515 | El Ocaso de un Estafador | 20180515 | 15th May 2018 | Centro Cultural General San Martín | Centro Cultural General San Martín | Argentina | |
| Oernulfova výprava, 18850915 | Oernulfova výprava | 18850915 | 15th September 1885 | Národní divadlo | Národní divadlo | Czech Republic | |
| Oi egklovismenoi i To telos ton paichnidion, 20010216 | Oi egklovismenoi i To telos ton paichnidion (The trapped ones or Endgames) | 20010216 | 16th February 2001 | Peiramatiki Skini Ethniko Theatro | Peiramatiki Skini (Ethniko Theatro) | Greece | 1 |
| Oi mnistires tou thronou, 19451102 | Oi mnistires tou thronou | 19451102 | 2nd November 1945 | Ethniko Theatro | Ethniko Theatro | Greece | |
| Oi mnistires tou thronou, 19840221 | Oi mnistires tou thronou | 19840221 | 21st February 1984 | ERT A’ Programma Radio | ERT A’ Programma Radio | Greece | |
| oikodomos Solnes, 19540714 | O oikodomos Solnes | 19540714 | 14th July 1954 | EIR B’ Programma Radio (Greece) | EIR B’ Programma Radio (Greece) | Greece | |
| Olaf Liliekrans, 19110618 | Olaf Liliekrans | 19110618 | 18th June 1911 | Rehearsal Theatre | Rehearsal Theatre | England | |
| Olaf Liljekrans, 18570102 | Olaf Liljekrans | 18570102 | 2nd January 1857 | Komediehuset | Komediehuset | Norway | 8 |
| Olaf Liljekrans, 20031017 | Olaf Liljekrans | 20031017 | 17th October 2003 | Ibsenmuseet | Ibsenmuseet | Norway | |
| Olaf, 20180620 | Olaf | 20180620 | 20th June 2018 | Barons Court Theatre | Barons Court Theatre | England | |
| Olav Liljekrans - Opera i tre akter av Arne Eggen, 19400611 | Olav Liljekrans - Opera i tre akter av Arne Eggen | 19400611 | 11th June 1940 | Nationaltheatret | Nationaltheatret | Norway | |
| Olav Liljekrans - Opera i tre akter av Arne Eggen. Libretto etter Henrik Ibsens skuespill "Olaf Liljekrans", 19601117 | Olav Liljekrans - Opera i tre akter av Arne Eggen. Libretto etter Henrik Ibsens skuespill "Olaf Liljekrans" | 19601117 | 17th November 1960 | Folketeatret | Folketeatret | Norway | |
| Olav Liljekrans, 19830603 | Olav Liljekrans | 19830603 | 3rd June 1983 | Kapitelberget | Kapitelberget | Norway | |
| Olav Liljekrans, 19970608 | Olav Liljekrans | 19970608 | 8th June 1997 | Ibsenhuset | Ibsenhuset | Norway | |
| Om Peer, 20190319 | OM PEER | 20190319 | 19th March 2019 | Ibsenhuset | Ibsenhuset | Norway | |
| Om Peer, 20220428 | Om Peer | 20220428 | 28th April 2022 | Kilden Teater- og Konserthus | Kilden Teater- og Konserthus | Norway | |
| One Actor's Show "The Travel of Peer Gynt", 20050915 | One Actor's Show "The Travel of Peer Gynt" | 20050915 | 15th September 2005 | Suntory Hall | Suntory Hall | Japan | |
| Only Child - by Simon Stone with Thomas Henning, inspired by Henrik Ibsen's Little Eyolf, 20090917 | The Only Child - by Simon Stone with Thomas Henning, inspired by Henrik Ibsen’s Little Eyolf | 20090917 | 17th September 2009 | Belvoir St. Theatre Upstairs | Belvoir St. Theatre Upstairs | Australia | 5 |
| Only Child - by Simon Stone with Thomas Henning, inspired by Henrik Ibsen's Little Eyolf, the, 20110826 | The Only Child - by Simon Stone with Thomas Henning, inspired by Henrik Ibsen’s Little Eyolf | 20110826 | 26th August 2011 | Herald Theatre, Aotea Centre | Herald Theatre, Aotea Centre | New Zealand | |
| Opekkhoman, 20091119 | Opekkhoman | 20091119 | 19th November 2009 | Experimental Theatre Hall Shilpakala Academy | Experimental Theatre Hall Shilpakala Academy | Bangladesh | |
| Opera Ibsen / Přízraky, 20220709 | Opera Ibsen / Přízraky (Opera Ibsen / Ghosts) | 20220709 | 9th July 2022 | Divadlo Antonína Dvořáka | Divadlo Antonína Dvořáka
(Antonín Dvořák Theatre) | Czech Republic | |
| Opory společnosti, 19100124 | Opory společnosti | 19100124 | 24th January 1910 | Národní divadlo | Národní divadlo | Czech Republic | |
| Opory společnosti, 19110221 | Opory společnosti | 19110221 | 21st February 1911 | Zámecké divadlo Kolín | Zámecké divadlo Kolín | Czech Republic | 1 |
| Opory společnosti, 19260512 | Opory společnosti | 19260512 | 12th May 1926 | Divadlo na Veveří | Divadlo na Veveří | Czech Republic | 1 |
| Opory společnosti, 19280309 | Opory společnosti | 19280309 | 9th March 1928 | Státní divadlo v Ostravĕ (Divadlo Jiřího Myrona) | Státní divadlo v Ostravĕ (Divadlo Jiřího Myrona) | Czech Republic | |
| Opory společnosti, 19381223 | Opory společnosti | 19381223 | 23rd December 1938 | Zemské divadlo v Brně | Zemské divadlo v Brně | Czech Republic | 1 |
| Opory společnosti, 19460413 | Opory společnosti | 19460413 | 13th April 1946 | Realistické divadlo | Realistické divadlo | Czech Republic | |
| Opory společnosti, 19550621 | Opory společnosti | 19550621 | 21st June 1955 | Severočeské divadlo Liberec | Severočeské divadlo Liberec | Czech Republic | |
| Opory společnosti, 19560415 | Opory společnosti | 19560415 | 15th April 1956 | Divadlo pracujících v Gottwaldovĕ | Divadlo pracujících v Gottwaldovĕ | Czech Republic | |
| Opory společnosti, 19560510 | Opory společnosti | 19560510 | 10th May 1956 | Československý rozhlas Brno | Československý rozhlas Brno | Czech Republic | |
| Opory společnosti, 19580223 | Opory společnosti | 19580223 | 23rd February 1958 | Krajské krušnohorské divadlo Teplice | Krajské krušnohorské divadlo Teplice | Czech Republic | |
| Opory společnosti, 19651127 | Opory společnosti | 19651127 | 27th November 1965 | Městské divadlo Kolín | Městské divadlo Kolín | Czech Republic | |
| Opory společnosti, 19660528 | Opory společnosti | 19660528 | 28th May 1966 | Divadlo J. K. Tyla | Divadlo J. K. Tyla | Czech Republic | |
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