The history of radiation therapy in the treatment of malignancies is closely linked to its use in Hodgkin lymphoma. It was less than a decade after the first publication on x-rays that radiotherapy was used in the treatment of a Hodgkin lymphoma. Over time, radiotherapy has evolved with newer technology and better understanding of radiobiology. During this same time frame, the treatment of Hodgkin and non-Hodgkin lymphomas has also seen great progress. This review will provide detail on modern radiotherapy techniques, indications for utilization, and modern radiation field sizes and doses.