Radiation therapy is a common modality used to treat lung cancer. The approach for radiation therapy varies by the type and stage of lung cancer. Stereotactic body radiation therapy (SBRT) is used for early-stage lung cancers or pulmonary metastases. Conventional fractionation is used for locally advanced lung cancer. Small-cell lung cancers can be treated with twice-daily radiation. Post-operative radiation therapy can be considered in some patients who undergo surgery. These different approaches vary in techniques for the planning and delivery of radiation to ensure proper delivery of treatment.