MONICA Risk, Genetics, Archiving and Monograph (MORGAM) is a multinational collaborative study based on harmonization of data from population-based cohort studies. MORGAM includes cohorts examined in the standardized WHO MONICA risk factor surveys and other similar cohorts which have been followed up for cardiovascular diseases and death. It was established in the late 1990's to explore the relationships between the development of cardiovascular diseases and their classic and genetic risk factors. Since the mid 2000s, MORGAM has also measured biomarkers from frozen sera, partly as part of the BiomarCaRE Project. Most of the cohorts participating in MORGAM are from Europe. The baseline periods of the cohorts vary between 1982 and 2014, and the longest follow-up periods are about 30 years. Here is presented the MORGAM Network which includes the cohort studies participating in MORGAM. Most of these studies have collected much more data than have been harmonized in MORGAM. Studies described on the Maelstrom catalogue may differ from the ones on the MORGAM website. More details about MORGAM, the cohorts and the harmonized data are in the MORGAM website.