Niccolò I

Niccolò I may refer to:


 * Niccolò I d'Este, Marquis of Modena and Ferrara (died 1344), see Duke of Ferrara and of Modena
 * Niccolò I Ludovisi (1634–1664)
 * Niccolò I Sanudo (died in 1341)
 * Niccolò I Trinci (died in 1421)