The Corpus Reformatorum (Corp. Ref., Cor. Ref., C.R., CR) ( Halle (Saale), 1834 sqq.), is the general Latin title given to a large collection of Reformation writings. This collection, which runs to 101 volumes, contains reprints of the collected works of John Calvin, Philip Melanchthon, and Huldrych Zwingli, three of the leading Protestant reformers. Texts in the CR are written in either Latin, French or German (using Fraktur typefaces).
A collection of sixteenth century Catholic writings, intended as a counterpart to the Corpus Reformatorum, was begun by Professor Joseph Greving (1868–1919) of the University of Bonn in 1915. It was announced that same year in the Theologische Revue as a "Plan für ein Corpus Catholicorum" or "Plan for a Corpus Catholicorum" 
The Corpus Reformatorum was founded through the efforts of German scholar and theologian Karl Gottlieb Bretschneider who began planning for it sometime after 1827. From 1834 until his death in 1848, Bretschneider also served as its primary editor.
 List of editors
- Karl Gottlieb Bretschneider (1776-1848)
- Heinrich Ernst Bindseil (1803-1876)
- Edward (Eduard) Reuss (Reuß) (1804–1891)
- August Edward (Eduard) Cunitz (Caunitz) (1812-1886)
- Johann Wilhelm (Guilielmus) (William) Baum (1806-1878)
- Emil Egli (1848-1908)
- Georg Finsler (1819-1899)
- Walther Köhler (1870-1946)
 The Corpus Reformatorum online
These works are being digitized by Google Books. Not all volumes are currently available. Many volumes which have been digitized are no longer available online.
 Series I: Philip Melanchthon, Opera Quae Supersunt Omnia - Volumes 1- 28
Volumes 1-15 edited by Karl Gottlieb Bretschneider. Volumes 16-28 edited by Heinrich Ernst Bindseil.
 Series II: Ioannis Calvini, Opera Quae Supersunt Omnia – Volumes 29- 87
Edited by Guilielmus Baum, Eduardus Cunitz, Eduardus Reuss.
- Opp. = Opera Quae Supersunt Omnia.
 Series III: Huldreich Zwinglis, Sämtliche Werke - Volumes 88-101
- The Fortnightly review, ed., Arthur Preuss, St. Louis, Missouri, Volume XXVI, No. 21, November 1, 1919, p. 332
- Karl Gottlieb Bretschneider. - Schaff-Herzog
- An English-language finding guide to John Calvin Opera quae supersunt omnia, edited by Guilielmus Baum, Eduardus Cunitz, and Eduardus Reuss; Calvin Opera 1-59, Corpus reformatorum 29-88, Brunswick and Berlin, 1863-1900, John Lee Thompson, Pasadena, Calif., John L. Thompson, 1995 
- Joannis Calvini opera quae supersunt omnia - Complete set of PDFs from the Université de Genève
- Concerning Bibliography, (xix) - The New Schaff-Herzog Encyclopedia of Religious Knowledge
- Philip Melanchthon. Literature (Portrait) - History of the Christian Church, Vol. 7 - Philip Schaff
- Select Bibliography Of the Reformation (2.1.3.) - Westminster Seminary California
- Complete Works of Calvin from the Corpus Reformatorum on CD - The Instituut voor Reformatieonderzoek (Institute for Reformation Research) - Apeldoorn.
- Many volumes of Calvin's works in the Corpus Reformatorum via Google Books
- Exegetical works of Zwingli: critical edition in the Corpus Reformatorum, voll. C-CIX
- Online Calvini Opera - 59 vols LatinFranc Text