| Title | Playwright | Genre | Cast | Length |
|---|---|---|---|---|
| O IT AIN'T ALL HONEY AND IT AIN'T ALL JAM | Renee | Musical | 1W 1M +pianist | one act |
| O TEMPERANCE | Mervyn Thompson | Drama(with songs) | 10W 7M | full length |
| OBJECTION OVERRULED | Carolyn Burns | Drama | 3W 3M | full length |
| OBSCENES FROM SHAKESPEARE | Andre Surridge | one act1M | ||
| OBSTACLES | Joseph Musaphia | Drama | 1W 2M | full length |
| OBVIOUS CHOICE | Dianne Bertenshaw | Comedy | 5W The | one act |
| OCCURENCES | Michael Heath | Drama | Cast 3 | one act (8scenes) |
| ODD DAY OUT | Dorothea Joburn | Farce | 6W 1child | one act |
| ODD ONE, THE | Kathleen Ross | Drama | 6W The | one act |
| ODDS AGAINST EVAN, THE | Anthony Taylor | Drama | 1W 6M | one act |
| OEDIPUS AND ANTIGONE | Brian E. Turner | Drama | 1W 1M | one act |
| OF MORGAN AND MURPHY | Kathleen Gallagher | 1W 2M | full length | |
| OFF TO THE LOUNGE | Michael Heath | Sketch | 3W 2M | |
| OFFERING, THE | Leslie F. Pearce | Sketch | 4W | |
| OFFSPRING | Kathleen Gallagher | 3W | full length | |
| OH CAPTAIN COOK | John Dunmore | Comedy | Cast 14 | two acts |
| OH KAIKOURA | Barry Grant | Comedy | 3W 2M | One Act |
| OH WHAT A BEAUTIFUL MORNING | Brian Turner | Drama | 1W 1M | one act |
| OK MR SHELLEY | Rosalie Carey | Drama | 4W 4M 1child | one act |
| OLD FLAMES DIE DOWN | Kay Mooney | Comedy | 3W The | one act |
| OLD FRIENDS | Karl Bradley | Comedy | 4W | one act |
| ON STAGE ONE: (see under titles) | The Big Drip | |||
| ON STAGE THREE: (see under titles) | Easy As Pie | |||
| ON STAGE TWO: (see under titles) | Five L Meeting King Bokassa | |||
| ONCE ON CHUNUK BAIR | Maurice Shadbolt | Drama | 13 M | full length |
| ONCE UPON A CHRISTMAS | Celia Harlen | Childrens | 10W 10M | full length |
| ONCE UPON A STORMY NIGHT | Joyce Rowland | Comedy | Cast 13 | one act |
| ONCE UPON A TIME PIECE | Tim Eliot | Childrens | Cast 4 | one act |
| ONCE, TWICE THRICE UPON A TALE | Murray Edmonds, Joy Cowley | Childrens | 2W 2M | one act |
| ONE FLESH, THE | Fiona Samuel | Drama | 3W 4M | one act |
| ONE FOR THE ROAD | Charles Hauter | Musical | Cast 8 | one act |
| ONE MAN GOON | Dora Somerville | Drama | 4W 5M | one act |
| ONE OF THOSE GIRLS | Jennifer Compton | Comedy | 1W 1M | full length |
| ONE WARRIORS WAR | Barry Grant | Drama | 3W 2M | |
| ONLY A ROSE | Joyce Rowland | 2W | one act | |
| OPEN DOOR, THE | Kevin Walsh | one act1W 3M | ||
| OPERATION VIVETTE | Bruce Phillips | Drama | 4W | one act |
| OPHELIA THINKS HARDER | Jean Betts, William Shakespeare | Fantasy (feminist) | 5W 4M | full length |
| ORACLES AND MIRACLES | Norelle Scott | Drama | 2W 1M | full length |
| ORDINARY NIGHTS IN WARD TEN. | Vincent O'Sullivan | Comedy | 4W 1M or 2W 3M | full length |
| ORDINARY PRINCESS, THE | Alannah O'Sullivan | Youth | 6W 8M+chorus | full length |
| ORIGINS OF POWER | Ken Hudson | Comedy | 1W 2M | full length |
| ORINOCO FLOW | Andre Surridge | Comedy | 2W 2M | one act |
| OSBERT THE HUGE MEETS MRS PERENDALIS | Alan Williamson | Childrens | Cast 13 | one act |
| OTHERS | Dennis Ralph | Drama | 4W 4M | full length |
| OUR DASHING DOCTOR | Alma Woods | Comedy | 3W The | one act |
| OURS BUT TO DO | David Hill | Drama | 3W 4M 15G 5B(doubling) | full length |
| OUT IN THE COLD | Greg McGee | Drama | 1W 3M | full length |
| OUTSIDE IN | Hilary Beaton | Drama | 7W | full length |
| OUTSIDE THE FRAME | Janinka Greenwood | Youth | 5W 5M | full length |
| OVERTURE TO MURDER | Iris Thomas | Drama | 5W 3M | one act |