Oasis Of The Zombies - (1983)
Director: Jesus Franco
Writing Credits: Jesus Franco
Starring: Manuel Gélin, Eduardo Fajardo, Lina Romay, Antonio Mayans, Javier Maiza, Albino Graziani

Oblong Box, The - (1969)
Director: Gordon Hessler
Writing Credits: Lawrence Huntington, Edgar Allan Poe
Starring: Vincent Price, Christopher Lee, Rupert Davies, Uta Levka, Sally Geeson, Alister Williamson, Peter Arne, Hilary Heath, Maxwell Shaw

Obsession - (1976)
Director: Brian De Palma
Writing Credits: Brian De Palma, Paul Schrader
Starring: Cliff Robertson, Geneviève Bujold, John Lithgow, Sylvia Kuumba Williams, Wanda Blackman, J. Patrick McNamara, Stanley J. Reyes, Nick Kreiger, Stocker Fontelieu

Octaman - (1971)
Director: Harry Essex
Writing Credits: Harry Essex, Leigh Chapman
Starring: Pier Angeli, Kerwin Mathews, Jeff Morrow, David Essex, Jerome Guardino, Robert Warner, Norman Fields

October Moon - (2005)
Director: Jason Paul Collum
Writing Credits: Jason Paul Collum
Starring: Judith O'Dea, Brinke Stevens, Sean Michael Lambrecht, Jeff Dylan Graham, Jerod Howard, Tina Ona Paukstelis

Octopus - (2000)
Director: John Eyres
Writing Credits: Michael D. Weiss
Starring: Jay Harrington, Ravil Issyanov

Octopus 2: River of Fear - (2001)
Director: Yossi Wein
Writing Credits: Boaz Davidson, Danny Lerner
Starring: Michael Reilly Burke, Meredith Morton, Fredric Lehne, John Thaddeus, Chris Williams, Stoyan Angelov, Paul Vincent O'Connor, Clement Blake, Duncan Fraser

Odd Noggins - (2000)
Director: Joe Sherlock
Writing Credits:
Starring: Tamsin Atkinson, Shannon Barksdale, Kimberly L. Cole, Ian Dunlap, Jeff Dylan Graham

Of Unknown Origin - (1983)
Director: George P. Cosmatos
Writing Credits: Chauncey G. Parker III, Brian Taggert
Starring: Peter Weller, Jennifer Dale, Lawrence Dane, Kenneth Welsh, Louis Del Grande, Shannon Tweed, Keith Knight

Off Season, The - (2004)
Director: James Felix McKenney
Writing Credits: James Felix McKenney
Starring: Christina Campenella, Don Wood, Angus Scrimm, Ruth Kulerman, Larry Fessenden, Francine Pado, Jamie Sneider

Off the Beaten Path - (2004)
Director: Jason Stephenson
Writing Credits: Jason Stephenson
Starring: Todd Hanson, Carrie Sizemore, Jessie Welsch, Tommy Thompson

Offerings - (1989)
Director: Christopher Reynolds
Writing Credits: Christopher Reynolds
Starring: Loretta Leigh Bowman, Elizabeth Greene, G. Michael Smith, Jerry Brewer, Tobe Sexton, J. Max Burnett, Doobie Potter, Rayette Potts, Mark Massey

Office Killer - (1997)
Director: Cindy Sherman
Writing Credits: Tom Kalin, Elise MacAdam
Starring: Carol Kane, Molly Ringwald, Jeanne Tripplehorn, Barbara Sukowa, Michael Imperioli, David Thornton, Mike Hodge, Alice Drummond

Offspring - (2009)
Director: Andrew van den Houten
Writing Credits: Jack Ketchum
Starring: Amy Hargreaves, Art Hindle

Offspring, The - (1987)
Director: Jeff Burr
Writing Credits: Jeff Burr, C. Courtney Joyner
Starring: Vincent Price, Clu Gulager, Terry Kiser, Harry Caesar, Rosalind Cash, Cameron Mitchell, Susan Tyrrell, Ron Brooks

Oh, No! Zombies!!! - (2003)
Director: David Petrison
Writing Credits: David Petrison, Brandon McDonald
Starring: Justin Purcell, Brian Dove, Jeffroy Geesa, Don McRoodin, Kate Estell, Nathaniel Sparks, Aaron McMillan, Ryan Wood