Introduction: The coronavirus disease (COVID-19) is caused by the new coronavirus SARSCoV-2 (severe acute respiratory syndrome coronavirus-2), which most often spreads between people through direct contact or through the air. The main treatment for most respiratory complications caused by COVID-19 is still symptomatic and focused on supportive care and respiratory physiotherapy. Aim of the research: To determine the effectiveness of respiratory physiotherapy in reducing post-COVID-19 respiratory symptoms (the values of FEV1, FVC, FEV1/FVC, DLCO, 6- minute walk test, strength of both hands, severity of shortness of breath according to Borg and MIP were compared and BEFORE and AFTER physiotherapy). Participants and methods: The research was conducted retrospectively and included 35 patients diagnosed with post-COVID-19 respiratory symptoms such as shortness of breath, cough, difficulty breathing at night, feeling short of breath, shortness of breath on exertion, and reduced fitness in the period from 3 months to a year after recovering from COVID-19. It were taken results from spirometry, diffusive lung capacity for carbon monoxide, shortness of breath according to the Borg scale, 6-minute walk test, hand grip strength and maximum inspiratory pressure BEFORE and AFTER the physiotherapy. Results: No statistically significant difference in FVC (L) was found before and after therapy (p=0.149), but a statistically significant difference in FVC (%) was found (p=0.002). The measurement of FEV1 (L), FEV1 (%) and FEV1/FVC before and after therapy did not reveal a statistically significant difference, although patients showed an increase in the value of the FEV1/FVC ratio (%). A statistically significant difference before and after the therapy was determined by comparing the DLCO ratio (%) (p=0.000), the 6-minute test value (p=0.004), the subjective feeling of shortness of breath according to the Borg scale (p=0.000), the strength value fist clenching with both hands (p=0.000), and maximum inspiratory pressure values (p=0.000). The mentioned values showed an improvement after the therapy. Conclusion: The obtained results confirm that there is a statistically significant difference in the reduction of symptoms after respiratory physiotherapy and that it is a successful treatment method in patients with post-COVID19 symptoms.