Despite a high curability rate, some patients with Hodgkin lymphoma (HL) fail to respond to, or relapse after, primary conventional treatment. This review aims to identify prognostic factors at relapse and guidelines for treatment in relapsed HL. Patients with relapsed HL should be identified according to their prognostic factors at relapse (duration of remission and extranodal disease or stage). This enables relapsing patients to be separated in to three different prognostic groups; primary refractory patients should be included in the unfavourable group because of their poor prognosis. All relapsed HL should receive second-line chemotherapy and the response to this chemotherapy is crucial for the outcome. Benefit of autologous stem-cell transplantation (ASCT) has been shown in a large randomized study and, although is often proposed in relapsed HL, it may be not necessary in the rare group of patients with stage I/II and late relapse who can receive additional radiotherapy after response to chemotherapy. Patients with intermediate and unfavourable relapse should receive high-dose chemotherapy and ASCT when chemosensitive; the first goal is to achieve this chemosensitivity. For patients in the unfavourable group, including refractory patients, the role of tandem HDT or allogeneic SCT will be discussed and should be proposed for patients not in complete remission at the time of HDT.