Girolamo Simoncelli (16 February 1817 – 2 October 1852) was an Italian political and military leader of the Risorgimento era.
He began his life as a businessman, but by 1845 he had been under scrutiny by the Papal authorities for his political ties and activities.
He joined the forces from the papal state that battled against the Austrians in Vicenza in 1848.
He returned to his native province, and was elected in 1849 as consigliere comunale to the Roman Republic.
He was named commander of the local civil guards, who had to confront some of crime and conspiracies spiking during the turbulent times.