Iván Marcano Sierra (Spanish pronunciation: [i'ßam ma?'kano]; born 23 June 1987) is a Spanish professional footballer who plays for Portuguese club FC Porto.
Mainly a central defender, he can also play as a left back.
After starting out at Racing de Santander and appearing for the club in La Liga, he went on to spend the better part of his career with Porto, playing nearly 200 competitive matches and winning the 2017–18 Primeira Liga.
He also had spells abroad in Greece (Olympiacos, twice), Russia and Italy.
Marcano represented Spain at under-21 level.