Duke Alexander Paul Ludwig Konstantin of Württemberg (9 September 1804 – 4 July 1885) was a German nobleman.

[1] His mother was Princess Henriette of Nassau-Weilburg (1780–1857), a daughter of Charles Christian, Prince of Nassau-Weilburg, and great-granddaughter of George II of Great Britain by his eldest daughter Anne, Princess Royal.

In 1835, he married Countess Claudine Rhédey von Kis-Rhéde (1812–1841), a Hungarian noblewoman whose non-royal ancestry resulted in the marriage being considered morganatic, thus depriving her issue of their paternal royal titles, status, and inheritance.

[4] After his wife's death Alexander suffered a mental breakdown, a condition which lasted for the rest of his life.

[5] In 1863, his children were all elevated by Alexander's first cousin and brother-in-law William I of Württemberg to the rank of Princes and Princesses of Teck.