Carlos Piera Gil (Madrid, 1942), is a Spanish poet in the Castilian language.

He studied at the French Lyceum in Madrid, at the Complutense University of Madrid and at the University of Barcelona.

He is a member of the Linguistic Circle of Madrid, together with Rafael Sánchez Ferlosio, Víctor Sánchez de Zavala, Agustín García Calvo and Isabel Llácer. He received his Ph.D. from UCLA with an unpublished thesis on metrics. He has been a professor at Cornell University (Ithaca, USA) and retired from the department of linguistics at the Autonomous University of Madrid. He was a member of the editorial board of the essay magazine La balsa de la medusa, and responsible for the metrics section of the Revista de Erudición y Critica.

He is the author of four books of poetry: Verses (1972), Anthology for a parrot (1984), What comes as if it were (1991) and Religio and other poems (2005). His poetry has been collected in a volume entitled Apartments for rent (2013), which includes loose poems not belonging to the previous books. He has published various essays, several of them compiled in two books, entitled Contrarieties of the subject (1993) and The morality of the witness (2012).