Marco Borriello (born 18 June 1982 in Naples) is an Italian footballer who plays striker for Serie A club Juventus, on loan from Roma. He has previously played for other Italian clubs, including Milan, Sampdoria, Treviso, Reggina, Empoli, Triestina, Roma, and Genoa.

Borriello came up through the ranks of Milan but was transferred to Treviso on loan before having the chance to prove himself at the club. After another move, he made his professional debut for Triestina in Serie C2, subsequently returning to Treviso. His 10 goals in 27 Serie C1 games with Treviso led to Milan's recalling him in June 2002.

Borriello made his Serie A debut for A.C. Milan on 21 September 2002 against Perugia but failed to establish himself and spent much of the next few years on loan at other Serie A clubs.

After only 3 appearances for Milan, he went on to shine for league rival Empoli for the rest of the 2002–03 Serie A season. He returned to Milan for the 2003–04 season but played in just 4 games. In the 2004–05 season, he was on loan to Reggina. In the 2005–06 season he was once again sent on loan, this time to Sampdoria along with Milan teammates Samuele Dalla Bona and Ignazio Abate. Borriello left Sampdoria in January 2006 for a six-month loan stint at Treviso where he scored his then-career best of 5 Serie A goals. Treviso were relegated that season.