Primary cutaneous T-cell lymphomas (CTCL), representing a heterogeneous group of non-Hodgkin's lymphomas (NHL), can be defined as clonal proliferation of skin-infiltrating T lymphocytes primarily presenting in the cutaneous compartment. They show a considerable variation in clinical presentation, histology, immunophenotype, and prognosis, which is best reflected by the proposal of the Cutaneous Lymphoma Study Group of the European Organization for Research and Treatment of Cancer (EORTC). Due to the heterogeneity of CTCL and the lack of curative therapy regimens, multiple strategies have been proposed for the management of the different CTCL entities. This includes topical application of corticosteroids, nitrogen mustard or carmustine (BCNU), radiotherapy, including total skin electron beam irradiation, photo(chemo)therapy, biological response modifiers, cytostatic chemotherapy, and combined regimens. More recently, fusion proteins and peptide vaccines have been introduced in the management of CTCL. Classification, staging, and treatment modalities are discussed in detail and summarized in a stage-adapted therapy regimen for CTCL.