| Illustrious Royal Order of Saint Ferdinand and of Merit | |
| Awarded By: | the Kingdom of Two Sicilies |
| Type: | Dynastic order of knighthood |
| For: | Important deeds and with proof of loyalty to the Head of the Royal House and to the Royal Family |
| Established: | 1 April 1800 |
| Higher: | Sacred Military Constantinian Order of Saint George |
| Lower: | Royal Order of the Two-Sicilies |
The Illustrious Royal Order of Saint Ferdinand and Merit is an order of knighthood of the Kingdom of the Two Sicilies.
It was established on 1 April 1800 by Ferdinand IV of Naples and III Sicily to reward men who performed important deeds and gave proof of loyalty to the Head of the Royal House and to the Royal Family.
The Order is divided into three Ranks:
The decoration is formed by a golden round shield bearing the image of St. Ferdinand, edged by a blue-enameled round plate with the inscription "FIDEI ET MERITO", bordered by six golden rays edged by six white enameled lilies. The ribbon is blue and edged in dark red.