Trojano or Troiano Spinelli (22 December 1712 – 1 January 1777) was an Italian nobleman, philosopher, economist, and historian, active in Naples.
His daughter Chiara Spinelli later the princess of Belmonte (1744-1823) was a painter, and for a time, mistress of Ferdinand I, King of the Two Sicilies.
Returning to Naples, he entered the enlightenment circles including Gaetano Filangieri, Ferdinando Galiani, and the Prince of Sansevero Raimondo di Sangro.
In his treatise on monetary policy, he opposed the reforms proposed by Carlo Antonio Broggia.
He renovated the family palace, the Palazzo Spinelli di Laurino in Naples.