The purpose of the present edition of Albert Lortzing's Die Opernprobe is to restore and clarify the composer's original intentions, which were often obscured or altered by the first published version, which appeared in 1899. This thesis is divided into two parts. Part One contains an introduction which discusses Lortzing's place in the history of German opera, the details surrounding the composition of Die Opernprobe, the musical and dramatic structure of the opera, and the sources used in the preparation of this edition. Part Two consists of a critical edition of the orchestral score, with the complete text of the spoken dialogue and stage directions. Critical notes and an English translation of the full text are included in two appendixes.