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Large granular lymphocyte leukaemias (LGL) are rare lymphoproliferative syndromes characterised by clonal expansion of T or NK lymphocytes in 85 and 15% of cases respectively. Interestingly, T and NK LGL leukaemias share a common pathophysiology and similar clinical and biological presentations. This lymphoproliferative syndrome is characterised by cytopenias and a frequent association with autoimmune diseases or manifestations. It is an indolent disease that in most cases allows for an abstinence-only strategy at diagnosis. However, the majority of patients will require initiation of treatment during follow-up. As NK cells lack a TCR, obtaining evidence of clonality in NK-ALL leukaemias is difficult. This is crucial in view of possible reactive expansions in the context of viral infections or dysimmune diseases. The diagnostic approach has been facilitated by the progress made in recent years in the understanding of the pathophysiology and the recent identification of recurrent mutations. In this review, we will discuss the pathophysiology of NK LGL leukaemias, present recent advances in diagnostic strategies before discussing therapeutic management. [ABSTRACT FROM AUTHOR]