Several institutions in the Andean region maintain ex situ collections of oca. The CIP preserves the largest collection of Oca germplasm in the world, with 881 accessions from various geographical areas of Argentina, Bolivia, Chile and Peru. The objective of this catalog is to place in the public domain all the information available on the Oca germplasm collection conserved at the CIP. In this first version, passport information and morphological characterization data for 463 Oca accessions have been included. The morphological characterization was carried out with the 18 Oca morphological descriptors published by IPGRI/CIP (2001). Morphological groupings were generated with the NTSYS program using a distance coefficient equal to zero. The diversity analysis carried out with the 16 most robust morphological descriptors shows that the 463 accessions evaluated can be classified into 254 morphotypes, which means that around 55% of the CIP collection would be represented by unique and different materials, and that the 45% would be made up of morphological duplicates.