| Country | Title | Year | Avg. (nb) | ||
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| Hong-Kong | On the Wrong Track | 毁滅號地車 | 1983 | 3.5 (3 Reviews) | |
| On Parole | 1993 | 2.83 (3 Reviews) | |||
| One Way Only | 單程路 | 1981 | 2.67 (3 Reviews) | ||
| Operation Pink Squad 2 | 1989 | 3.67 (3 Reviews) | |||
| On Trial | 失業生 | 1980 | 3 (2 Reviews) | ||
| Once a Black Sheep | 1992 | 2.88 (2 Reviews) | |||
| The Rangers | 1974 | 3 (2 Reviews) | |||
| Our Neighbor Detective | 街坊差人 | 1994 | 2.5 (2 Reviews) | ||
| Off Track | 馬路英雄 | 1991 | 3 (2 Reviews) | ||
| On Parole 2 | 1993 | 3.25 (2 Reviews) | |||
| Our Time Will Come | 2017 | 2 (2 Reviews) | |||
| One of the Lucky Ones | 伴我同行 | 1994 | 3.75 (2 Reviews) | ||
| Oh! My Cops | 1983 | 2.5 (2 Reviews) | |||
| Obsession | 1993 | 1.62 (2 Reviews) | |||
| Offence Storm | 1993 | 2.25 (2 Reviews) | |||
| Our Sister Hedy | 四千金 | 1957 | 3.12 (2 Reviews) | ||
| The Other Side of the Sea | 1994 | 2.38 (2 Reviews) | |||
| The Other Side of Dolls | 1993 | 1.5 (2 Reviews) | |||
| Over the Rainbow Under the Skirt | 1994 | 3.25 (2 Reviews) | |||
| On Fire | 1996 | 1 (1 Reviews) | |||
