| Country | Title | Year | Avg. (nb) | ||
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| Japan | Ballad of Orin | Hanre Goze Orin | 1977 | 3.12 (2 Reviews) | |
| Oblivion Island | Hottarake no shima - Haruka to maho no kagami | 2009 | 4 (2 Reviews) | ||
| Prostitute Torture Hell | (秘) 女郎責め地獄 | 1973 | 3.62 (2 Reviews) | ||
| Oh! Bomb | ああ爆弾 | 1964 | 2.75 (2 Reviews) | ||
| Ozamu Tezuka's Buddha | Tezuka Osamu no budda: Akai sabaku yo! Utsukushiku | 2011 | 2.75 (2 Reviews) | ||
| Over Your Dead Body | Makoto Yotsuya Kaidan | 2014 | 2.5 (2 Reviews) | ||
| Oh-Oku, The Women Of The Inner Palace | Oh-oku | 2006 | 2.25 (2 Reviews) | ||
| One Man of the Gambler's Code | Kutsukake tokijiro - yukyo ippiki | 1966 | 3 (1 Reviews) | ||
| On a Paper Crane: Tomoko’s Adventure | Tsuru ni Notte | 1994 | 3.5 (1 Reviews) | ||
| Our Marriage | 私たちの結婚 | 1961 | 3 (1 Reviews) | ||
| Onoda: 10,000 Nights in the Jungle | 2021 | 2.5 (1 Reviews) | |||
| Outlaw Cop | Yasagure Keiji | 1976 | 1.5 (1 Reviews) | ||
| Owl | Fukuro | 2003 | 3.25 (1 Reviews) | ||
| Okita Soji | Okita Sôji | 1974 | 2.25 (1 Reviews) | ||
| Kaei | Kaei | 1961 | 4.25 (1 Reviews) | ||
| One Piece the Movie: Baron Omatsuri and the Secret Island | One piece : Omatsuri danshaku to himitsu no shima | 2005 | 2.75 (1 Reviews) | ||
| Our House | Watashitachi no ie | 2017 | 3.5 (1 Reviews) | ||
| onna to misoshiru | 女と味噌汁 | 1968 | 4.25 (1 Reviews) | ||
| Off Highway 20 | Kokudō 20-gōsen | 2007 | 2 (1 Reviews) | ||
| Oppai Volleyball | 2009 | 0.75 (1 Reviews) | |||
