The International Workshop on Chronic Lymphocytic Leukemia (iwCLL) is a biennial meeting focused solely on advancing the understanding and treatment of chronic lymphocytic leukemia (CLL) and related lymphoproliferative disorders. Founded in 1979, iwCLL is now the largest international meeting dedicated to advancing state-of-the-art and emerging concepts – from laboratory-based research to the clinic – in the pathobiology and treatment of these blood cancers. The biennial meeting is intended to provide a forum that promotes the exchange of information and encourages collaboration among international leaders and scientists interested in CLL and lymphoproliferative disorders in one location for four days every other year.