This prospective, observational study evaluated the real-world safety of osimertinib in a broad Chinese population with non-small cell lung cancer (NSCLC).Chinese NSCLC patients who received osimertinib were enrolled and followed up for 12 months. The primary endpoint was the incidence of adverse drug reactions (ADRs).From 20 April 2020 to 1 August 2022, 1,700 patients were enrolled from 30 centers, with 706 (41.5%) patients ≥65 years old. Osimertinib was administered as first-line, second-line, third/later-line and adjuvant therapy in 44.9%, 34.2%, 14.3% and 4.5% of the patients, respectively. ADRs, adverse events (AEs), Grade ≥3 AEs, and serious AEs were reported in 627 (36.9%), 959 (56.4%), 165 (9.7%), and 102 (6.0%) patients, respectively. AEs of special interests occurred in 59 (3.5%) patients, with 41 (2.4%) and 19 (1.1%) reporting QTc prolongation and interstitial lung disease/pneumonitis-like events, respectively. The safety profiles in patients ≥65 years old and those usually not included in randomized clinical trials were similar to that in the total population.This largest real-world safety study of osimertinib in China demonstrated that osimertinib was well-tolerated in a broad NSCLC population, including patients usually not included in randomized clinical trials, without new safety signals identified.NCT03485326 (www.clinicaltrials.gov).