| Name (692) | Creators | Event Dates | Events | Resources |
|---|---|---|---|---|
| The Oceanides | Jean Sibelius | 2004 | 1 | |
| Ochres | Bernadette Walong, David Page, Djakapurra Munyarryun, Stephen Page | 1994 - 2021 | 8 | |
| Octandre | Edgar Varese | 1988 | 1 | |
| Octet in F, Op. 166, D. 803 | Franz Schubert | 1984 - 1995 | 9 | |
| October | Ian Wilding | 2007 - 2010 | 2 | |
| The Octoroon | Dion Boucicault | 1870 - 1912 | 8 | 1 |
| An Octoroon | Branden Jacobs-Jenkins | 2017 - 2021 | 2 | |
| The Odd Couple | Neil Simon | 1966 - 2020 | 41 | |
| Odd Man In | Claude Magnier | 1960 - 1978 | 6 | |
| Odd Man Out | F W Hyland | 1932 | 1 | |
| Odd Man Out | David Williamson | 2017 | 1 | |
| Odditorium | The Women's Circus | 2003 | 1 | |
| Oddlands | Back to Back Theatre | 2017 - 2024 | 9 | 1 |
| Oddodyssey | Ralph Tyrrell, Willy Young | 1972 | 1 | |
| Ode for St Cecilia's Day - Handel | 2010 | 1 | ||
| Ode on Odd Fellowship | Daniel O'Connell | 1870 | 1 | |
| Ode to Joy | Ludwig van Beethoven | 2013 - 2019 | 2 | |
| An Ode to Music | J M Ennis | 1904 | 1 | |
| Ode to Nonsense | Andy Packer, Jane Goldney, Quincy Grant, Slingsby | 2013 | 1 | |
| Ode to Spring | Bryceson Treharne | 1908 | 1 | |
| Odyssea | Sensorium Theatre | 2015 - 2017 | 2 | |
| Odyssey | Andreas Litras, John Bolton | 1997 - 2006 | 6 | |
| The Odyssey | Homer | 2005 - 2016 | 5 | |
| Odyssey of a Prostitute | Jack Hibberd | 1984 - 1997 | 4 | |
| The Odyssey of Runyon Jones | Norman Corwin | 1 | ||
| Oedipus | Sophocles | 1948 - 2014 | 46 | 1 |
| Oedipus and Antigone | Sophocles, Dudley Fitts, Robert Fitzgerald | 2020 | 1 | |
| Oedipus at Colonus | Sophocles | 1975 - 2014 | 4 | |
| Oedipus Doesn't Live Here Anymore | Daniel Evans | 2015 | 1 | |
| Oedipus Mk II | Jim Daly | 1982 | 1 | |
| Oedipus Rex | Igor Stravinsky | 2010 | 1 | |
| Oedipus Schmoedipus | Post | 2014 | 1 | |
| Of All But Truth | Collins Bourke | 1954 | 1 | |
| Of Angels and Light | Compagnia di Valerio Festi | 2004 | 1 | |
| Of Babies and Men | Sally Chance Dance | 2024 - 2025 | 2 | |
| Of Mice and Men | John Steinbeck | 1940 - 2021 | 19 | |
| Of Stars and Streetlights | Albert Lin | 2022 | 1 | |
| Of the Causes of Wonderful Things | Tayla Rubin | 2010 - 2011 | 4 | |
| Of Thee I Sing | George Gershwin, Ira Gershwin, Morrie Ryskind | 2015 | 2 | |
| Off Stage | Eileen Kramer | 1940 | 1 | |
| Off the Hook | Derek Benfield | 1988 - 2016 | 2 | |
| Off The Hook | Dylan Moran | 2015 | 1 | |
| Off The Record | Zoe Coombs Marr | 2016 | 3 | |
| Offending the Audience | Peter Handke | 1973 - 2001 | 5 | |
| Office Interlude | Kathleen Carroll | 1940 - 1965 | 5 | 2 |
| Officer 666 | Augustin McHugh | 1913 - 1916 | 3 | |
| The Officers' Mess | 1919 | 1 | ||
| Oft Have I Sighed | Thomas Campion | 1951 | 1 | |
| Often I Find That I Am Naked | Fiona Sprott | 1998 - 2010 | 8 | |
| Og Jeg Vil ha Mig en Hjertenskjaer | Edvard Grieg | |||
| Ogives | Erik Satie | 1991 | 1 | |
| Oh | Ted Neilsen | 1978 | 1 | |
| Oh Boy | Guy Bolton, Jerome Kern, P G Wodehouse | 1918 - 1919 | 5 | |
| Oh Dad, Poor Dad, Mamma's Hung You in the Closet | Arthur Kopit | 1961 - 2011 | 6 | |
| Oh Sir Jasper! | Bob Bishop | 2016 | 1 | |
| Oh The Horror! | Anthony Biancofiore, Lee Gambin, Melanie Schmidt, Sarah McKeown | 2009 | 2 | |
| Oh Well Never Mind Bye | Steven Lally | 2010 | 1 | |
| Oh! Calcutta! | Kenneth Tynan | 1970 - 1975 | 7 | 4 |
| Oh! De Bulgine | 1854 | 1 | ||
| Oh! Dear, What Can The Matter Be | Charles Woodhouse | 1950 | 1 | |
| Oh! Let Thy Tears | Adolf Jensen | 1907 | 1 | |
| Oh! Memory | Henry Leslie | 1911 | 2 | |
| Oh! Oh! Delphine!!! | C M S McLellan, Ivan Caryll | 1918 - 1919 | 4 | |
| Oh! Quand je Dors, S. 282 | Franz Liszt | 1952 | 1 | |
| Oh! Susannah | 1850 | 1 | ||
| Oh! That's Different | Lionel Shave | 1933 | 1 | |
| Oh! What a Night | Christopher Barr, Jonathan Biggins, Phillip Scott | 2002 | 1 | |
| Oh! Whistle While You're Happy | Max Afford | 1939 | 1 | |
| Oh, Charming May | 1854 | 1 | ||
| Oh, Come | ||||
| Oh, Didn't It Rain (Roud #6699) | 1971 | 5 | ||
| Oh, Lady! Lady!! | Guy Bolton, Jerome Kern, P G Wodehouse | 1921 - 1931 | 5 | |
| Oh, the Apple Tree | Doreen Clarke | 1980 - 1981 | 2 | 1 |
| Oh, The Humanity and Other Good Intentions | Will Eno | 2011 | 1 | |
| Oh, What a Lovely War! | Joan Littlewood | 1966 - 2018 | 29 | |
| Oh, What a Town | Burton Graham | 1966 | 1 | |
| Ohio Impromptu | Samuel Beckett | 1982 | 1 | 1 |
| Ohne Sorgen | ||||
| Ohne Sorgen Polka Op 271 | Josef Strauss | 1983 | 1 | |
| Oi for England | Trevor Griffiths | 1984 | 1 | |
| Oil | Ella Hickson | 2019 - 2023 | 2 | |
| Okho | Iannis Xenakis | 1997 | 1 | |
| Oklahoma! | Oscar Hammerstein II, Richard Rodgers | 1949 - 2020 | 114 | 1 |
| Ola Kala | Les Arts Sauts | 2006 | 2 | |
| Old 104th | 1939 | 1 | ||
| The Old Allegiance | Alexander Turner | 1936 | 1 | 2 |
| Old and Young | John Poole | 1835 | 1 | |
| The Old Bachelor | William Congreve | |||
| Old Bill, M.P. | Bruce Bairnsfather, Seymour Hicks | 1924 | 1 | |
| The Old Boy | A R Gurney | 1993 | 1 | |
| Old Chelsea | Fred S Tysh, Richard Tauber, Walter Ellis | 1951 - 1977 | 2 | |
| The Old Country | Alan Bennett | 1979 - 2011 | 4 | |
| Old English | John Galsworthy | 1925 - 1926 | 3 | |
| An old English Idyll | Jonathan Foulds | 1950 | 1 | |
| Old English Song. The Lass with the delicate air | Thomas Arne | 1908 - 1937 | 3 | |
| The Old Familiar Juice | Jim McNeil | 1970 - 2003 | 14 | 3 |
| Old Fidelity | Charles Miran | 1859 | 1 | |
| Old Flames | E A Whitehead | 1976 | 1 |