Niccola Paracciani Clarelli[a] (12 April 1799 – 7 July 1872) was a Catholic Cardinal and was Arch-Priest of St. Peter's Basilica at the Vatican.

He was also Camerlengo of the Sacred College of Cardinals, Prefect of the Congregation for Bishops and Secretary of the Roman Curia.

He was educated at the Archgymnasium of Rome where he received a doctorate in utroque iuris, both civil and canon law on 8 July 1822.

He received his episcopal consecration at the patriarchal Vatican Basilica from Pope Gregory XVI on 11 February.

Clarelli participated in the Papal Conclave of 1846 that elected Pope Pius IX and in the First Vatican Council in 1869 and 1870.