| Subject | Title | Author | Volume(Issue) |
| Oak Island, Nova Scotia | Secrets of Oak Island, The | Joe Nickell | 24(2)14-19 | Buy this back issue |
| Oberg, James E. | Velikovsky Affair, The | David Morrison | 3(4)16 | Buy this back issue |
| Oberg, James E. | Soviet UFOs, Missiles, and the Gindilis Report | Kendrick Frazier | 7(3)7-8 | Buy this back issue |
| Oberg, James E. | Velikovsky Affair, The | J. Richard Greenwell | 5(3)75 | Buy this back issue |
| Oberg, James E. | Velikovsky Affair, The | David Morrison | 5(3)76 | Buy this back issue |
| Oberg, James E. | In Brief | Kendrick Frazier | 4(2)15 | Buy this back issue |
| Oberg, James E. | Omni's Column on UFOs | Kendrick Frazier | 3(3)8-10 | Buy this back issue |
| Oberg, James E. | UFOlogy | James M. McCampbell | 2(2)140 | Buy this back issue |
| Oberg, James E. | Velikovsky Affair, The | Henryk H. Bauer | 5(3)74-75 | Buy this back issue |
| Occam's Razor | Occam's Razor & the Nutshell Earth | Martin Gardner | 12(4)355-358 | Buy this back issue |
| Occam's Razor | Occam's Razor | Elie A. Shneour | 10(4)310-313 | Buy this back issue |
| Occult, The | Appeal of the Occult, The | Phillip Stevens, Jr | 12(4)376-385 | Buy this back issue |
| Occult, The | New Items on Occult Bookshelf | Lys Ann Shore | 12(2)117 | Buy this back issue |
| Occult, The | Occult Authors Owe MacLaine a Real Debt of Gratitude | Lys Ann Shore | 12(2)116 | Buy this back issue |
| Occult, The | France Possessed By the Occult & Irrational | Barry James | 14(3)232-233 | Buy this back issue |
| Occult, The | Fighting Occultists | S. Carlson & A. Masche | 14(1)101 | Buy this back issue |
| Occult, The | Library of Congress Drops "Occult Sciences" Term | Kendrick Frazier | 12(3)238 | Buy this back issue |
| Occupations | Guardian Astrology Study, The | Geoffrey Dean | 9(4)327-338 | Buy this back issue |
| Official UFO (publication) | Official UFO | No Author | 2(1)16 | Buy this back issue |
| Ohio | Creation Science Banned From Lakewood, Ohio, Classrooms | William Cohen-Kiraly | 21(1)6-8 | Buy this back issue |
| Ohio | South Shore Skeptics | Page Stephens | 9(2)191 | Buy this back issue |
| Oil Exploration | Profits and Prophecy | Donald U. Wise | 23(5)28-31 | Buy this back issue |
| Oil Exploration | Science in the Oil Patch: Microlepton Fields, Again | Tom Barber | 26(3)8-9 | Buy this back issue |
| Oklahoma City Bombing | Bombing Suspect McVeigh a Believer in Strange Government Conspiracies | Brandon M. Stickney. | 21(3)5-6 | Buy this back issue |
| Olson, Terry | New Zealand UFO Flap, The | Robert Sheaffer | 3(3)5-7 | Buy this back issue |
| Olympics, The | Olympic Spoon-Bending: Failed Flame Fires Geller Claim | Tim Walker | 25(1)9 | Buy this back issue |
| Omand, Donald | | Robert Sheaffer | 6(2)15 | Buy this back issue |
| Omni(publication) | Omni's Column on UFOs | Kendrick Frazier | 3(3)8-10 | Buy this back issue |
| Omni(publication) | Curious Case of Omni's Column Criticizing CSICOP, The | Kendrick Frazier | 11(4)334-335 | Buy this back issue |
| Open-Mindedness | Open Minds and the Argument from Ignorance | Jonathan E. Adler | 22(1)41-44 | Buy this back issue |
| Operation Ridicule | Operation Ridicule | No Author | 2(1)16 | Buy this back issue |
| Optics | Testing New Claims of Dermo-Optical Perceptions | Claudio Benski and Scientists from CRSSA. | 22(1)21-16 | Buy this back issue |
| Oregon State Legislature | Oregon State Legislature | No Author | 2(1)16 | Buy this back issue |
| Organ Snatching | Bitter Harvest: The Organ-Snatching Urban Legends | Benjamin Radford | 23(3)34-39,48 | Buy this back issue |
| Origin of Life | Sugar in Meteorites Find Lends Support to Space Origin of Life's Building Blocks | No Author | 26(2)9,12 | Buy this back issue |
| Origin of Life | It's Life, Captain - But Only As We Know It | Ralph Estling | 26(2)57-58 | Buy this back issue |
| Origin of Life | Where Do We Come From | Massimo Pigliucci | 23(5)21-27 | Buy this back issue |
| Orstan, Aydin | Natural and Supernatural | Steuart Campbell | 10(2)190-191 | Buy this back issue |
| Ortiz, William | | Robert Sheaffer | 7(3)21 | Buy this back issue |
| Otis, Laura | Belief and Selective Exposure | Kendrick Frazier | 3(4)13 | Buy this back issue |
| Oui(publication) | | Robert Sheaffer | 5(4)12 | Buy this back issue |
| Out on a Limb (book) | MacLaine, McTaggart and McPherson | Martin Gardner | 8(3)214-218 | Buy this back issue |
| Out-of-Body Experiences | Beyond the Body | Susan . Reviewed by James E. Alcock | 8(1)74-77 | Buy this back issue |
| Out-of-Body Experiences | Incorporeal Complications | Antony Flew | 8(4)381-382 | Buy this back issue |
| Out-of-Body Experiences | Swann's Song and Hynek | No Author | 3(3)54 | Buy this back issue |
| Out-of-Body Experiences | Brain Site Located that Induces Illusory Out-of-Body Experiences | Kendrick Frazier | 27(1)12 | Buy this back issue |
| Out-of-Body Experiences | | Robert Sheaffer | 6(3)12 | Buy this back issue |
| Out-of-Body Experiences | Psychology and Near-Death Experiences | James E. Alcock | 3(3)25-41 | Buy this back issue |
| Out-of-Body Experiences | Psi Claims from the Menninger Foundation | James Randi | 5(4)8-9 | Buy this back issue |
| Out-of-Body Experiences | Out-of-Body Experiences | John Brunner | 7(3)95 | Buy this back issue |
| Outer Space Interface (audio cassette) | | Robert Sheaffer | 9(2)124 | Buy this back issue |
| Owens, Ted | | Robert Sheaffer | 5(1)18 | Buy this back issue |
| Oxford Union (Oxford University) | Oxford Union Debates UFOs | Ian Ridpath | 6(3)7-8 | Buy this back issue |
| Oxygen Therapy | Pseudoscience of Oxygen Therapy, The | John M. Allen | 24(1)40-43 | Buy this back issue |
| O’Brien, Ronald J. | ‘Prophet for Profit’ Describes New Cult Leader O’Brien | Joe Nickell | 24(6)8-9 | Buy this back issue |
