Herbig-Haro (HH) objects are small-scale shock regions intimately associated with star forming regions. The present catalogue includes for all known HH objects: the HH number, previous designations if any, a position, the most probable energy source, and the region and distance. Additionally, extensive notes give a brief description of each object with detailed references to the literature. The catalogue will be updated as developments in the field require. Important Notice: This catalogue will not be published in any journal. It is available through the WWW at http://casa.colorado.edu/hhcat Reference to this catalogue should be done as follows: Reipurth, B.: 1999, {\em A general catalogue of Herbig-Haro objects}, 2. edition, http://casa.colorado.edu/hhcat