"Alexander Duff" is the name of:

* Alexander Duff (missionary) (1806–1878), Scottish missionary

* Sir Alexander Duff (British Army officer) (1777–1851), Scottish general and Lord Lieutenant of Moray

* Alexander Duff, 3rd Earl Fife (1731–1811), Scottish nobleman

* Alexander Duff, 1st Duke of Fife and 6th Earl Fife (1849–1912)

* Alexander Ludovic Duff (1862–1933), Royal Navy officer

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