| Name (692) | Creators | Event Dates | Events | Resources |
|---|---|---|---|---|
| O | Jack Hibberd | 1968 - 1982 | 7 | 1 |
| O 1984 | Jack Hibberd | 1967 - 1997 | 3 | |
| O Bid Your Faithful Ariel Fly | Thomas Linley | 1900 - 1956 | 3 | |
| O Brave New Tempest | Ever After Theatre Company | 2007 | 3 | |
| O Care, Thou Will Dispatch Me | Thomas Weelkes | 1951 | 1 | |
| O Come, Immanuel | Alec Rowley | 1953 | 1 | |
| O Dear What Can The Matter Be | 1854 | 2 | ||
| O Death, it is the Cold Night | Frances Allitsen | 1901 | 1 | |
| O del mio Amato Ben | Stefano Donnaudy | 1949 | 1 | |
| O Divine Redeemer | Charles Gounod | 1899 - 1915 | 4 | |
| O Fair and Sweet and Holy | Anton Rubinstein | 1913 - 1918 | 2 | |
| O Friendly Stars in the Sky, Aria, K. 538 | Wolfgang Amadeus Mozart | 1985 | 1 | |
| O Gott, du Frommer Gott, BWV 767 | Johann Sebastian Bach | 1954 - 2019 | 3 | |
| O Gu: The Ritual of Death | Yoon-taek Lee | 2 | ||
| O How Amiable: Anthem | Vaughan Williams | 1983 | 1 | |
| O Hush Thee, My Babie | Arthur Seymour Sullivan, Walter Scott | 1907 - 1912 | 2 | |
| O Kühler Wald, Op. 72, No. 3 | Johannes Brahms | 1950 | 1 | |
| O Lamm Gottes Unschuldig, BWV 656 | Johann Sebastian Bach | 1955 - 1956 | 2 | |
| O Leggiadri Occhi Belli | 1944 | 1 | ||
| O Liebliche Wangen, Op. 47, No. 4 | Johannes Brahms | 1954 - 1956 | 2 | |
| O Listen to the Voice of Love | 1910 | 1 | ||
| O Little Town of Bethlehem | Gordon Phillips | 1951 | 1 | |
| O Lord, Have Mercy Upon Me | Giovanni Battista Pergolesi | 1912 | 1 | |
| O Matko Majo | Stanislaw Moniuszko | 1952 | 1 | |
| O Memory | Henry Leslie | 1908 - 1915 | 4 | |
| O Mensch, Bewein dein Sünde Gross, BWV 622 | Johann Sebastian Bach | 1951 - 2015 | 4 | |
| O Mistress Mine | Roger Quilter | 1945 | 1 | |
| O Mistress Mine | Willam Byrd | 1951 | 1 | |
| O Sacrum Convivium | Olivier Messiaen | 1984 - 1998 | 2 | |
| O Sacrum Convivium | Thomas Tallis | |||
| O Salutaris Hostia | Gioacchino Rossini | 1916 | 1 | |
| O si Che non Sapevo Sospirare | Ermanno Wolf-Ferrari | 1905 | 2 | |
| O Sing unto the Lord | Henry Purcell | 1983 | 1 | |
| O Sing unto the Lord - Purcell | 1981 | 1 | ||
| O Softly Singing Lute | Francis Pilkington | 1951 - 1952 | 2 | |
| O That It Were So, H. 105 | Frank Bridge | 1939 - 1950 | 2 | |
| O Thou, My Field, Op. 4, No. 5 | Sergei Rachmaninoff | 1953 | 1 | |
| O Tod, wie Bitter Bist Du, Op. 121, No. 3 | Johannes Brahms | 2019 | 1 | |
| O vos omnes | Carlo Gesualdo | 2002 | 1 | |
| O Welt, ich Muss dich Lassen, Op. 65, No. 21 | Sigfrid Karg-Elert | 1951 - 1953 | 3 | |
| O Willow, Willow! (Traditional) | 1912 | 1 | ||
| O World | Gertrud Bodenwieser | 1945 | 1 | |
| O wusst' ich Doch den Weg Zuruck, Op. 63, No. 8 | Johannes Brahms | 1900 - 1952 | 2 | |
| The O'Brien Girl | Frank Mandel, Louis A Hirsch, Otto Hauerbach | 1922 - 1940 | 5 | |
| O'Callaghan in His Last Legs | 1870 - 1871 | 2 | ||
| O'Flaherty VC | George Bernard Shaw | 1966 - 1977 | 4 | |
| O'Leary | Richard Hall | 1962 | 1 | |
| O, By Rivers | Henry Bishop | 1913 | 1 | |
| O, Thank Me Not | Albert Mallinson | 1915 | 1 | |
| O, That We Two Were Maying | Alice Mary Smith | 1908 | 1 | |
| An Oak Tree | Tim Crouch | 2008 - 2011 | 5 | |
| The Oaks Cafe | Russell Dumas | 1999 | 1 | |
| The Oath of Bad Brown Bill | Stephen Axelsen | 1986 | 1 | |
| The Obelisk | Michael Easton | 1985 | 1 | |
| Ober de Mountain | 1853 | 1 | ||
| Oberon, J. 306 | Carl Maria von Weber, James Robinson Planché | 1866 - 1953 | 3 | |
| Oberon, J. 306, "Ocean, thou Mighty Monster" | Carl Maria von Weber | 1906 - 1949 | 2 | |
| Oberon, J. 306, "Overture" | Carl Maria von Weber | 1906 - 2014 | 5 | |
| Oberon: or, The Charmed Horn | George Macfarren, Thomas Cooke | 1836 | 1 | |
| Oberon; or, The Elf King's Oath | James Robinson Planché | 1836 | 1 | |
| Oberon; or, The Knight and the Caliph's Daughter | George Burnett Barton | 1865 | 2 | |
| Obi; or, Three-Fingered Jack | John Fawcett | 1836 | 1 | |
| The Object of Desire | Julia Britton | 2007 | 1 | |
| Objection Overruled | Carolyn Burns | 1982 - 2023 | 11 | 1 |
| Objects for Meditation | William Yang | 2005 - 2006 | 9 | |
| Objects Lie on a Table | Gertrude Stein | 2003 | 1 | |
| Obliques II: le Recit | Gilbert Amy | 1997 | 1 | |
| Oboe Concerto | Domenico Cimarosa | 1991 | 1 | |
| Oboe Concerto | Tomaso Albinoni | 1994 | 1 | |
| Oboe Concerto | Ross Edwards | 2002 | 1 | |
| Oboe Concerto | Graeme Koehne | 2000 - 2001 | 2 | |
| Oboe Concerto | Frank Martin | 2006 | 1 | |
| Oboe Concerto in C major | Johann Hertel | 2025 | 2 | |
| Oboe Concerto in C RV 447 | Antonio Vivaldi | 1992 | 1 | |
| Oboe Concerto in C, K. 314 | Wolfgang Amadeus Mozart | 1985 - 2012 | 6 | |
| Oboe Concerto in D minor | Allensandro Marcello | 2024 | 2 | |
| Oboe concerto in D-Major | Richard Strauss | 1988 - 2014 | 5 | |
| Oboe Concerto in E Flat | Vincenzo Bellini | 1984 | 1 | |
| Oboe Concerto in F Major KapM Jiranek 15 | Frantisek Jiranek | 2024 | 1 | |
| Oboe Concerto No. 1 in B-Flat Major, HWV 301 | George Frideric Handel | 1952 - 1956 | 2 | |
| Oboe Concerto No. 3 | 1991 | 1 | ||
| Oboe Concerto No. 3 in G-Minor, HWV 287 | George Frideric Handel | 1953 - 1985 | 2 | |
| Oboe Concerto, II., "Musette" | Ralph Vaughan Williams | 1947 | 1 | |
| Oboe Quartet in F, K. 370 | Wolfgang Amadeus Mozart | 1983 - 1991 | 3 | |
| Oboe Sonata in C Minor, HWV 366, Op. 1, No. 8 | George Frideric Handel | 1956 | 1 | |
| The Obscene Madame D | Hilda Hilst | 2018 | 1 | |
| Observe the Sons of Ulster Marching Towards the Somme | Frank McGuinness | 1990 - 2011 | 3 | 1 |
| Obsession | Industry Dance | 2010 | 1 | |
| Obsessive Behaviour in Small Spaces | Ian Stocks, Robert Trebor Lang | 1977 | 1 | |
| Obstinate Little Tart | Beth McMullen | 2019 | 1 | |
| OC/DC | Brenna Glazebrook | 2011 | 1 | |
| Occasional Combustible Disaster | Daniel Cottier | 2024 | 1 | |
| Occasional Dances | Russell Dumas, Dance Exchange | 1989 | 1 | |
| Occupations | Trevor Griffiths, La Boite Theatre Company | 1981 | 1 | |
| Occupied | RAG Theatre | 2009 | 1 | |
| Ocean Island Mine | Latai Taumoepeau | 2023 | 1 | |
| The Ocean of Life; or Every Inch a Sailor | John Thomas Haines | 1854 | 2 | |
| An Ocean Out My Window | Andrew Bovell | 1986 | 1 |