Rafael Chaparro Madiedo (born December 23, 1963 in Bogotá, died April 18, 1995 in Bogotá) was a Colombian writer who won Colombia's 1992 National Literature Prize for his only novel Opium in Clouds (Opio en las nubes).
His novel, Opium in Clouds received little initial literary acclaim outside of the National Literature award, but has been very popular among young adults in Colombia and has an extended online fan base.