Marco Castoldi (born 23 December 1972), better known by his stage name Morgan, is an Italian singer and musician.

He has also been a judge for eight seasons in the Italian version of The X Factor, winning five of them through acts he mentored: Aram Quartet (series 1 – 2008), Matteo Becucci (series 2 – 2008–9), Marco Mengoni (series 3 – 2009), Chiara Galiazzo (series 6 – 2012) and Michele Bravi (series 7 – 2013).

He was also a coach on The Voice Of Italy 2019.

He is also a founding member of Bluvertigo, an Italian band formed in 1992.

Morgan has 3 daughters; the first, Anna Lou Castoldi, with Asia Argento.