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- Dalmasca: is a small kingdom in Final Fantasy XII. It is the central location for most of the game.
- Dalmatia: a tiny Germanic nation whose royal family were exiled to Great Britain after a communist revolution there. Seen in the TV series You Rang, M'Lord?.
- Danu: setting of Timothy Mo's 1991 novel The Redundancy of Courage, based on East Timor.
- Dasah: trucial state on an island in the Persian Gulf in the novel The Business by Iain Banks.
- Dave, The Republic of: a single generational Republic led by Dave in the video game Fallout 3. The country is depicted to be about 20 kilometers north of the main DC area.
- Dawsbergen: neighbor of Graustark
- Defastena: The idyllic sister-state of The Defastenkunstrepublik.
- Defastenkunstrepublik: Oldest of the three states composing the Defastenist Empire. Was the subject for a series of paintings by the Defastenist artist Gary Farrelly produced between 2003 and 2007.
- De La Rocha: A Middle-Eastern monarchy in the series Metajets
- Derbaran:a country in the shooter War Rock.
- Derkaderkastan: from the film Team America: World Police
- Dinotopia: a hidden, utopian island from James Gurney's illustrated books
- Dolaronia: from the Cantinflas film "Su Excelencia", a parody of the United States
- Dominion of Divinity: a theocratic dystopia that replaces the United States in the novel The Butterfly and the Flame by Dana De Young
- Dos Rios: South American country in Biggles television series.
- Double Crossia: a country mentioned in the Three Stooges short You Nazty Spy
- Drachenschweig: Grand Duchy of Drachenschweig, setting of Roger K. Miller's 2010 novel Dragon in Amber
- Drackenberg: a European country from Lloyd Alexander's The Drackenberg Adventure
- Dregovia: mentioned in a mission of the video game Jurassic Park: Operation Genesis where the player must rescue its visiting president.
- Dreisenberg: A tiny Germanic nation featured in the pilot of The Secret Service.
- Dresdania: A Balkan principality in the Solar Pons story The Adventure of the Frightened Governess
- Droon*: A magical world in the Secrets of Droon series by Tony Abbott
- Drusselstein: A small, poor European country that was the birthplace of Heinz and Roger Doofenschmirtz in Phineas and Ferb.
- Dschinnistan (Djinnistan): in the novel Ardistan and Dschinnistan by Karl Friedrich May
- Dubinia: The rival country of Bahavia in the TV show Cory in the House.
- Duloc: name of the kingdom in Shrek ruled by Lord Farquaad
- Ducklovia: a country bordering Serbia in Count Duckula
Read more about this topic: List Of Fictional Countries