Simple Summary: Non-small-cell lung cancer (NSCLC) is the leading cause of cancer-related death worldwide, with almost half of all patients diagnosed with non-metastatic disease (stage IA-IIIC). The treatment options for patients with NSCLC are evolving rapidly, and survival outcomes have improved since the introduction of immunotherapies and targeted treatments in the non-metastatic setting. In this study, we explored treatment patterns and outcomes for patients with non-metastatic NSCLC in Sweden prior to the availability of these treatments. Patient outcomes were comparable with those reported in other real-world studies; however, the prognosis for patients with NSCLC, particularly at higher disease stages, remained poor. These results provide a baseline upon which to evaluate the effectiveness of immunotherapies and targeted treatments as they are introduced into routine clinical practice, including for patients in the non-metastatic setting. Non-small-cell lung cancer (NSCLC) is the leading cause of cancer-related death worldwide, with similar to 40-50% of patients diagnosed with non-metastatic disease (stages IA-IIIC). The treatment landscape is evolving rapidly as immunotherapies and targeted therapy are introduced in the non-metastatic setting, creating a need to assess patient outcomes prior to their introduction. This real-world study using Swedish National Lung Cancer Registry data examined outcomes (overall survival (OS) and time to next treatment or death (TTNTD)) and treatment patterns for adults diagnosed with non-metastatic NSCLC. Baseline characteristics and OS from diagnosis were described for all patients; OS, treatment patterns, and TTNTD from treatment start were described for the treatment subgroup (patients diagnosed from 2014 onwards), stratified by disease stage and initial treatment. OS and TTNTD were described using the Kaplan-Meier estimator. The overall population (2008-2019) included 17,433 patients; the treatment subgroup included 5147 patients. Median OS (interquartile range) overall ranged from 83.3 (31.6-165.3) months (stage I patients) to 10.4 (4.3-24.2) months (stage IIIB patients). Among the treatment subgroup, median OS and TTNTD were longest among patients receiving surgery versus other anticancer treatments. These findings provide a baseline upon which to evaluate the epidemiology of non-metastatic NSCLC as newer treatments are introduced.