| Name (692) | Creators | Event Dates | Events | Resources |
|---|---|---|---|---|
| Old Gooseberry | T J Williams | 1871 | 1 | |
| Old Guard | 1856 | 1 | ||
| The Old Guard | Henry Brougham Farnie, Robert Planquette | 1854 - 1915 | 8 | |
| Old Heads and Young Hearts | Dion Boucicault | 1888 | 2 | 1 |
| Old Herbaceous | Alfred Shaughnessy | 1981 | 3 | |
| The Old House At Home | 1870 | 3 | ||
| Old Irish Melody, Intermezzo for Strings | J M Ennis | 1912 - 1918 | 2 | |
| Old King Cole | Ken Campbell | 1976 - 1981 | 3 | |
| Old King Crow | 1854 | 1 | ||
| The Old Lady | J W Heming | 1938 | 1 | |
| Old Lady 31 | Rachel Crothers | 1919 | 1 | |
| The Old Lady Shows Her Medals | J M Barrie | 1922 - 2016 | 5 | |
| The Old Law | Philip Massinger, Thomas Middleton, William Rowley | 1891 | 1 | |
| The Old Maid and The Thief | Gian Carlo Menotti | 1970 - 2025 | 6 | |
| Old Man | Matthew Whittet | 2012 | 1 | |
| The Old Man and the Old Moon | PigPen Theatre Co. | 2021 | 1 | |
| An Old Man Taught Wisdom | Henry Fielding | 1800 - 1804 | 3 | |
| Old Masters | Beatrix Christian | 2001 | 1 | |
| Old Melbourne Town | Allan Aldous | 1 | ||
| Old Mrs. Wiley | Harry Tighe | 1927 | 1 | |
| The Old Neighborhood | David Mamet | 1999 | 1 | |
| The Old Oak Chest | Jane M Scott | 1837 - 1841 | 2 | |
| The Old One Smiles | Joan Brampton | 1948 - 1961 | 2 | |
| Old Regimentals | 1849 | 1 | ||
| The Old School Tie | Jack Hibberd | 1988 - 1997 | 2 | |
| Old Soldiers | Henry James Byron | 1891 | 1 | |
| Old Stock: A Refugee Love Story | Christian Barry, Hannah Moscovitch | 2019 | 2 | |
| Old Times | Harold Pinter | 1971 - 2016 | 16 | |
| The Old Tower of Lobenicht | Gavin Bryars | 1995 | 1 | |
| An Old Tryst | J Matthew Ennis | 1905 | 2 | |
| Old Wicked Songs | Jon Marans | 1998 - 2018 | 5 | |
| The Old Woman | Joseph Campbell | 1847 | 1 | |
| Old World | Aleksei Arbuzov | 1982 | 1 | |
| Oldenberg | Barry Bermange | 1977 | 1 | |
| The Oldest Profession | Paula Vogel | 2001 - 2016 | 2 | |
| Ole Aunt Sally | Howard's Ethiopian Serenaders | 1853 | 1 | |
| Ole Bull in Fix | 1870 | 1 | ||
| Ole Dan Tucker | 1849 | 2 | ||
| Ole Grey Goose | 1850 - 1854 | 2 | ||
| Ole Uncle Ned | 1850 | 1 | ||
| Oleanna | David Mamet | 1993 - 2011 | 16 | |
| The Olive Tree | Antonietta Morgillo | 1990 | 1 | 1 |
| Oliver Cromwell | Benjamin Britten | 1954 - 2013 | 2 | |
| Oliver Twist | Charles Dickens | 1865 - 2016 | 59 | |
| Oliver! | Lionel Bart | 1960 - 2022 | 109 | |
| Olivette | Alfred Duru, Edmond Audran, Henri Chivot | 1881 - 1911 | 2 | |
| Olivia | Malcolm Sircom | 2019 | 1 | |
| Olivier | Edwin Kemp Attrill | 2020 | 1 | |
| Ollie and the Minotaur | Duncan Graham | 2008 - 2016 | 3 | |
| Ollikins and His Dinah | 1855 | 1 | ||
| Oly Tar Ribber | 1853 | 2 | ||
| Olympians | Michael Griffin | 1995 | 1 | |
| Olympus On My Mind | Barry Harman, Grant Sturiale | 1987 - 1992 | 2 | |
| OM | Robert Sturrock, Industry Dance | 2009 | 1 | |
| Omaha Tribal Melody. The Moon Drops Low. | Charles Cadman | 1917 | 1 | |
| The Omnibus | Jules Verne | 1848 - 1870 | 4 | |
| On | Lucy Guerin | 2003 - 2009 | 14 | |
| On a Fly Drinking Out of His Cup | Paul Hindemith | 1951 | 1 | |
| On Again Off Again | Ian Scott, Noellie Taylor | 1984 | 1 | |
| On an Overgrown Path, "The Little Owl" | Leoš Janáček | 1956 - 1958 | 2 | |
| On an Overgrown Path, "The Virgin of Frydek" | Leoš Janáček | 1958 | 1 | |
| On an Overgrown Path, "Vivo" | Leoš Janáček | 1958 | 1 | |
| On an Overgrown Path, JW 8/17 | Leoš Janáček | 1959 | 1 | |
| On Approval | Frederick Lonsdale | 1928 - 1979 | 14 | |
| On Baile's Strand | William Butler Yeats | 1947 - 1969 | 2 | |
| On Borrowed Time | Paul Osborn | 1948 | 1 | |
| On Craig Dhu | Arthur Symons, Frederick Delius | 1948 | 1 | |
| On Ego | Mick Gordon, Paul Broks | 2009 | 1 | |
| On Golden Pond | Ernest Thompson | 1990 - 2016 | 12 | |
| On Monday Next | Philip King | 1951 - 1987 | 7 | |
| On My Death Day | Zuzi Fort | 2011 | 1 | |
| On Off: On the Edge of Change | France Hervé, Stephen Bain | 1999 | 1 | |
| On Our Selection | Steele Rudd | 1912 - 2016 | 45 | 6 |
| On Parade | Marion Bosci | 1966 | 1 | |
| On Passion | Dorothy Porter | 2010 | 1 | |
| On Shifting Sandshoes | Paul Davies | 1988 | 1 | |
| On Stage Oz | Dean Letcher, Martin Sharp, Richard Neville, Richard Walsh | 1966 | 2 | |
| On Stage Vietnam | Mona Brand, New Theatre (Sydney, NSW) | 1 | ||
| On Suicide | Bertolt Brecht, Hanns Eisler | 2012 | 11 | |
| On the Blind Side | John Collins | 1985 | 1 | |
| On the Brow of Richmond Hill, Z. 405 | Henry Purcell | 1952 - 1970 | 3 | |
| On the Docks | Alex Bayliss, Rex Ablett | 2015 | 1 | |
| On the Edge | Wayne Macauley | 1980 | 1 | |
| On the Edge of Happiness | Kenneth Ross | 1978 | 1 | |
| On the Edge of the Future | Lloyd Ross | 1933 | 2 | 2 |
| On the Harmful Effects of Tobacco | Anton Chekhov | 1959 - 2015 | 17 | |
| On the High road | Anton Chekhov | 1979 | 1 | |
| On the Level | Ron Grainer, Ronald Millar | 1966 | 2 | |
| On The Lurk | H G Nelson | 2005 | 1 | |
| On the Misconception of Oedipus | Matthew Lutton, Tom Wright, Zoë Atkinson | 2012 | 1 | |
| On the Nature of Daylight | David Dawson, Max Richter | 2016 | 1 | |
| On the Nature of Lo, Etc | Ernest Bunbury | 1965 | 1 | |
| On the North Diversion Road | Tony Perez | 1994 | 1 | |
| On the Origin of Species | Charles Darwin | 2010 | 1 | |
| On the Production of Monsters | Robert Reid | 2012 | 1 | |
| On the Razzle | Tom Stoppard | 1985 | 1 | |
| On the Road to Damascus | Maud Clark, Stella Tarrant | 1987 - 1988 | 2 | |
| On the Rocks | George Bernard Shaw | 1934 | 1 |