Marcelli is an Italian surname. Notable people with the surname include:
Abbondio Marcelli (1932–2015), Italian rower Kyle Marcelli, (born 1990), Canadian racing driver Nino Marcelli (1890–1967), Italian composer and conductor Nino Marcelli (born 2005), Slovak footballer Ulderico Marcelli (1882–1962), Italian composer and musician Vittorio Marcelli (born 1944), former Italian road cyclist
See also Giru Marcelli, a city and bishopric in Roman North Africa :Category:Claudii Marcelli, members of the ancient Roman gens Claudius from the branch of Marcellus