Paper Castles (Spanish: Castillos de cartón) is a 2009 Spanish romantic drama film directed by Salvador García Ruiz [es] from a screenplay by Enrique Urbizu based on the novel Castillos de cartón by Almudena Grandes.

Set in Madrid in the 1980s, the plot concerns about the love triangle between three art students, María José, Marcos, and Jaime.

Oskar L. Belategui of El Correo considered that "afflicted with a languid rhythm and a lacerating visual poverty", the film fails both as "a moral tale and as a story of initiation".

[6] Jonathan Holland of Variety assessed that the film feels as "flimsy as its title" and cannot be saved from Urbizu's "uncharacteristically overwrought" script, best efforts from the three leads notwithstanding.

"[7] Jordi Costa [es] of El País found the film to be "one of the least sexual movies with the most sex that [he] remembers watching", citing "the praiseworthy effort of swimming against inertia and commonplace".