The Austrian Myeloid Registry (aMYELOIDr) is a non-interventional study. It collects data from patients with the myeloid diseases, primarily myelodysplastic syndromes (MDS), chronic myelomonocytic leukemia (CMML) and acute myeloid leukemia (AML).The aMYELOIDr is multi-center database collecting data at various sites in Austria and potentially also at other centers in other countries in future. The registry has an electronic case report form (eCRF), where all data is entered by clinical trial personnel and/or physicians. It is set up to collect real-world experience in the management of patients with these diseases in Austria.