Sem Ghelardini (30 March 1927 – 12 January 1997) was an Italian sculptor and artisan.
He was known as a master marble-carver and was the founder of Studio Sem in Pietrasanta which has executed the monumental works of many contemporary sculptors, including Henry Moore and Joan Miro.
Helaine Blumenfeld and Harold F.
Clayton are amongst the artists who learned marble carving at his studio.
Ghelardini died in Pietrasanta, the city of his birth, at the age of 69.
Studio Sem continues to the present day, directed by his former assistant and collaborator Keara McMartin and his youngest son Pierangelo Ghelardini.