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- 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?.
- Darklonia: Country ruled by Destro's cousin, Darklon, in G.I. Joe: A Real American Hero.
- Dawsbergen: neighbor of Graustark.
- Doppelkinn: neighboring principality to Barscheit (Harold MacGrath, The Princess Elopes, 1905).
- Drackenberg: a European country from Lloyd Alexander's The Drackenberg Adventure.
- Drecq: appeared in Adele Ferguson Knight's The Right to Reign: A Romance of the Kingdom of Drecq (1912). Note phonetic similarity to the German noun "Dreck", which means manure.
- Dreisenburg: A tiny Germanic nation featured in the pilot of The Secret Service.
- Duchy of Strackenz: A tiny European country in the novel Royal Flash by George MacDonald Fraser that borders Denmark and Germany. It is threatened with invasion by both countries as a result of the Schleswig-Holstein Question.
- Drusselstein: a fictional Germanic country in Phineas and Ferb
- Ducklovia: a country bordering Serbia in Count Duckula.
Read more about this topic: List Of Fictional European Countries