Lung cancer remains the leading cause of cancerârelated death worldwide. The disease is classified into two major subtypes, smallâcell lung cancer (SCLC) and the more prevalent nonâsmallâcell lung cancer (NSCLC). Firstâline conventional therapies, such as chemotherapy, radiotherapy and surgery, have offered limited benefit, and patient prognosis remains poor with postâtreatment recurrences representing a major cause of morbidity. Consequently, there is an urgent need for improved therapeutic options. Historically, NSCLC has been considered a nonâimmunogenic disease. However, increased understanding of tumorâimmune interactions has challenged this paradigm in both lung and other malignancies, with cancer elimination by tumorâspecific T cells increasingly well described in a myriad of solid tumors. Recent evidence has demonstrated that absent or weak anticancer responses are likely a product of tumorâderived immunosuppression. This knowledge, along with a greater appreciation for the role of T cells in lung cancer elimination, has driven development of novel immunotherapeutic approaches which are demonstrating remarkable clinical efficacy. This review examines the role of T cells in lung cancer, discussing the direction and clinical significance of current and future immunotherapeutic strategies.