Casillas may refer to: Casillas, Guatemala, a municipality in the department of Santa Rosa, Guatemala Casillas, Ávila, a municipality located in the province of Ávila, Castile and León, Spain Casillas de Coria, a municipality located in the province of Cáceres, Extremadura, Spain Casillas de Flores, a municipality located in the province of Salamanca, Castile and León, Spain Casillas de Camineros, structures built every 6 kilometers alongside major roads in Puerto Rico Casillas (surname)