Parts III and IV, published here as part of the complete concordance of Calderón de la Barca's works, with the concordances of the dramas and comedias, contain their entire vocabulary in alphabetical order, in keyword in context format. In addition to the reference to the respective work and the person speaking, the source field also contains a page and line count. The basis is the Obras completas by Aguilar. For the first time, all of Calderón's linguistic material is thus available in a complete and easily consultable form, and Calderón's theatre can be used by researchers as the reference work that it was in historical reality for the extraordinarily rich theatre production of the Siglo de Oro. This is part IV, volume 20 (Comedias M-O) of the concordance.