Ludvig Vilhelm August Douglas, Count of Mühlhausen, Gondelsheim, Skenninge and Stjernorp, Lord of Langenstein and Stjernorp castles (24 November 1849 - 20 July 1916), was a conservative Swedish politician and official. He was a direct patrilineal descendant of Field Marshal Robert Douglas.
Ludvig Douglas was born at Zürich, Switzerland. His parents were Count Carl Israel Douglas (1824-1898), first count of the Douglas family in the nobility of Baden (since 1848) as Count of Mühlhausen, and his wife Countess Louise von Gondelsheim and Langenstein (1825-1900), herself a daughter of the morganatic marriage of Louis I, Grand Duke of Baden and Katharina Werner. Through his mother, he was a second cousin of Victoria of Baden, wife of King Gustaf V of Sweden.
He received the fideicommiss of Muhlhausen and the castle of Langenstein as his share of the family inheritance and reclaimed in c1875 his ancestral castle of Stjernorp in Sweden, which had been lost to his family after a fire in 1789. He ultimately succeeded his childless elder brother as head of the comital House of Douglas.
Douglas was a protectionist and solidly oriented towards Germany. From 1895 to 1899, he served as Minister of Foreign Affairs of Sweden. He resigned because he refused to accept that Norway (then in union with Sweden) would have their flag without the mark of the union, i.e. he opposed the so-called pure flag. 
He also held the position of Riksmarskalk (Marshal of the Realm) (1911-1916), Landshövding (governor) of Uppsala County (1893-1895), and Landshövding (governor) of Östergötland County (1901-1912). Douglas worked for the Norrlander farmers' party against the forest products companies, they demanded protective legislation in field of wood market.
His wife was Countess Anna Louise Ehrensvärd, daughter of Count Albert Ehrensvärd the Elder, Minister of Foreign Affairs of Sweden (1885-1889), and sister of Count Albert Ehrensvärd the Younger, Minister of Foreign Affairs of Sweden (1911-1914).
The Swedish branch of the Counts Douglas, to which Ludvig belonged, was the main surviving lineage of the family until Ludvig's sons and grandsons created several new branches (which spread over both Sweden and Germany. Lines descended from Ludvig Douglas include:
- von Douglas-Langenstein, descendants of Robert, eldest son of Ludvig. They hold the palace of Langenstein in Baden-Württemberg, Germany. Robert's second (and childless) wife was Augusta Victoria of Hohenzollern, dowager queen of Portugal.
- von Reischach-Douglas, descendants of a grandson of Robert von Douglas-Langenstein
- Douglas-Gerstorp, the branch (settled in Sweden) descending from the youngest son of Robert von Douglas-Langenstein
- Douglas-Stjernorp, the branch descending from the Swedish general Archibald Douglas-Stjernorp, second son of Ludvig. In this branch is held the Castle of Stjärnorp
- Douglas-Kolfall, the branch descending from Oscar, the youngest son of Ludvig.
- "Article 13 -- No Title" (PDF). The New York Times. 1895-06-18. p. 5. Retrieved 2010-02-20.
- "Norwegian Consular Flag Adopted." (PDF). The New York Times. 1899-07-26. p. 7. Retrieved 2010-02-20.
- "Norwegian Flag Law Stands" (PDF). The New York Times. 1899-10-14. p. 7. Retrieved 2010-02-20.
- worldstatesmen.org, Counties of Sweden: Uppsala, retrieved 2010-02-20
- worldstatesmen.org, Counties of Sweden: Ostergotland, retrieved 2010-02-20