Primary lymphomas of the conjunctiva are extremely infrequent and usually belong to extranodal marginal zone B-cell lymphoma of MALT or MALT lymphoma. Radiotherapy with lens shielding is one of the most employed therapeutic options. Four patients with MALT lymphomas of the conjunctiva with complete and maintained response to radiotherapy are reported. The effectiveness as well as the lack of significant toxicity of radiotherapy are emphasized.