| Name : | A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # All |
| Name | Description |
| Ocampa [1] | Planet, homa to the Ocampa people [1] |
| Oceanus IV [2] | Inhabited planet. [2] |
| Ogus II [3] | The Enterprise-D crew took shore leave here in 2367 [3] |
| Ohniaka III [4] | Planet in the Ohniaka system. [4] |
| Omega IV [5] | Home planet of the Khoms and Yangs; an ancient civilisation was almost wiped out by a bacteriological war here. [5] |
| Omekla III [6] | Obsidian Order shipyards located here [6] |
| Omicron Ceti III [7] | Planet which was bombarded by Berthold rays; site of a failed Federation colony. [7] |
| Omicron IV [8] | Earthlike planet almost destroyed by nuclear weapons [8] |
| Omicron Theta [9] | The planet on which Data was built. The Federation settlement here was wiped out by the Crystalline Entity. [9] |
| Ophiucus III [10] | Harcourt Fenton Mudd planned to sell some women as wives here [10] |
| Oran'taku [11] | Rajiin's home world. [11] |
| Orelius IX [12] | Asteroidal planetoid [12] |
| Orendal V [13] | Delta Quadrant planet. [13] |
| Organia [14] | Home of the Organians, non-corporeal beings who ended the Federation Klingon war [14] |
| Orias III [6] | In the Orias system [6] |
| Orion I [15] | Planet on which the Institute of Cosmology is located. [15] |
| Ornara [16] | Planet located in the Dala system. The natives of Ornara had significant industry, but exported the bulk of their products to the neighbouring Brekka in return for the "medicine" felicium. [16] |
| Oshionion Prime [17] | Planet known for having marshlands which were considered scenic, at least by Talaxian standards. Voyager carried a holoprogram which simulated Oshionion Prime. [17] |
| Osinar VI [18] | Planet on which an uncle of Riska's runs a bar. [18] |
| Otar II [19] | Destination of the Enterprise-D following the death of Lal [19] |
| Name : | A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # All |
| Canon source | Backstage source | Novel source | DITL speculation |
| # | Series | Season | Source | Comment |
| 1 | VOY | 1 | Caretaker | |
| 2 | TNG | 5 | The Game | |
| 3 | TNG | 4 | Brothers | |
| 4 | TNG | 6 | Descent, Part 1 | |
| 5 | TOS | 2 | The Omega Glory | |
| 6 | DS9 | 3 | Defiant | |
| 7 | TOS | 1 | This Side of Paradise | |
| 8 | TOS | 2 | Assignment: Earth | |
| 9 | TNG | 1 | Datalore | |
| 10 | TOS | 1 | Mudd's Women | |
| 11 | ENT | 3 | Rajiin | |
| 12 | TNG | 3 | Booby Trap | |
| 13 | VOY | 6 | Survival Instinct | |
| 14 | TOS | 1 | Errand of Mercy | |
| 15 | VOY | 6 | Good Shepherd | |
| 16 | TNG | 1 | Symbiosis | |
| 17 | VOY | 6 | Fury | |
| 18 | DS9 | 3 | Life Support | |
| 19 | TNG | 3 | The Offspring |
| Series : | VOY Season 1 |
| Episode : | Caretaker |
| Series : | TNG Season 5 |
| Episode : | The Game |
| Series : | TNG Season 4 |
| Episode : | Brothers |
| Series : | TNG Season 6 |
| Episode : | Descent, Part 1 |
| Series : | TOS Season 2 |
| Episode : | The Omega Glory |
| Series : | DS9 Season 3 |
| Episode : | Defiant |
| Series : | TOS Season 1 |
| Episode : | This Side of Paradise |
| Series : | TOS Season 2 |
| Episode : | Assignment: Earth |
| Series : | TNG Season 1 |
| Episode : | Datalore |
| Series : | TOS Season 1 |
| Episode : | Mudd's Women |
| Series : | ENT Season 3 |
| Episode : | Rajiin |
| Series : | TNG Season 3 |
| Episode : | Booby Trap |
| Series : | VOY Season 6 |
| Episode : | Survival Instinct |
| Series : | TOS Season 1 |
| Episode : | Errand of Mercy |
| Series : | VOY Season 6 |
| Episode : | Good Shepherd |
| Series : | TNG Season 1 |
| Episode : | Symbiosis |
| Series : | VOY Season 6 |
| Episode : | Fury |
| Series : | DS9 Season 3 |
| Episode : | Life Support |
| Series : | TNG Season 3 |
| Episode : | The Offspring |
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