Casillas

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)