| Country | Title | Year | Avg. (nb) | ||
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| Hong-Kong | One of the Lucky Ones | 伴我同行 | 1994 | 3.75 (2 Reviews) | |
| One Summer With You | 2005 | 2.25 (1 Reviews) | |||
| One Way Only | 單程路 | 1981 | 2.67 (3 Reviews) | ||
| Only Fools Fall in Love | 呆佬拜壽 | 1995 | 3.31 (4 Reviews) | ||
| Operation Billionaires | 驚天大賊王 | 1998 | 2.17 (3 Reviews) | ||
| Operation Pink Squad | 霸王女福星 | 1988 | 2.62 (4 Reviews) | ||
| Operation Pink Squad 2 | 1989 | 3.67 (3 Reviews) | |||
| Operation Scorpio | Jie zi zhan shi | 1991 | 3.41 (33 Reviews) | ||
| Opium and the Kung-fu Master | 1984 | 3.5 (10 Reviews) | |||
| The Opium Trail | 1973 | 2.5 (1 Reviews) | |||
| Option Zero | Ｇ４ 特工 | 1997 | 2.64 (9 Reviews) | ||
| Ordinance 17 | 1981 | 3 (1 Reviews) | |||
| Ordinary Heroes | 千言万语 | 1999 | 3.21 (7 Reviews) | ||
| Osaka Wrestling Restaurant | 大阪撻一餐 | 2004 | 2.5 (7 Reviews) | ||
| The Other 1/2 and the Other 1/2 | 我愛太空人 | 1988 | 2.75 (1 Reviews) | ||
| The Other Side of Dolls | 1993 | 1.5 (2 Reviews) | |||
| The Other Side of Gentleman | 君子好逑 | 1984 | 2.5 (3 Reviews) | ||
| The Other Side of the Sea | 1994 | 2.38 (2 Reviews) | |||
| Our Neighbor Detective | 街坊差人 | 1994 | 2.5 (2 Reviews) | ||
| Our Sister Hedy | 四千金 | 1957 | 3.12 (2 Reviews) | ||
