Marcello Stella (died 1642) was a Roman Catholic prelate who served as Bishop of Isernia (1640âÂÂ1642).
Marcello Stella was ordained a priest on 29 June 1636. On 26 March 1640, he was appointed during the papacy of Pope Urban VIII as Bishop of Isernia. On 9 April 1640, he was consecrated bishop by Gil Carrillo de Albornoz, Cardinal-Priest of Santa Maria in Via, with Vincenzo Napoli, Bishop of Patti, and Deodato Scaglia, Bishop of Melfi e Rapolla, serving as co-consecrators. He served as Bishop of Isernia until his death in 1642.