It is a challenge to treat malignant pleural mesothelioma with radiation therapy (RT). For many years, conventional RT was delivered after extrapleural pneumonectomy (EPP) with acceptable results.However, the benefit of RT has never been definitively proven. Intensity modulated radiation therapy (IMRT) has been used, but some of the early experiences revealed fatal toxicity. As experience has increased, it now appears that RT, particularly with IMRT, is both feasible and effective.