Mangroves frequently encounter high wind velocity and surge from tropical cyclones. While studies have documented mangrove recovery immediately after these events, long-term impacts of these cyclonic events on mangrove regeneration are unclear. To examine the regeneration patterns of mangrove forests after two major cyclonic events, Cyclone 1988 and 2007, in Sundarbans, Bangladesh, we employed time-series image analysis of Landsat 5 TM, 7 ETM+ and 8 OLI surface reflectance images between 1987-2020 (33 years). Using Google Earth Engine, we preprocessed and prepared three time series vegetation indices: (i) normalized difference water index (NDWI) (ii) normalized difference vegetation index (NDVI) and (iii) enhanced vegetation index (EVI). Results showed that inter-annual medians of NDWI, NDVI and EVI varied significantly. Overall, a decline of annual NDWI, NDVI and EVI values immediately after the cyclonic events was observed. However, mangrove forests recovered to the level before cyclones in about 1-3 years. Disturbance by Cyclone 2007 took longer time to be recovered than that by Cyclone 1988. After Cyclone 2007, highest reduction of vegetation index was observed in inter annual median NDVI (0.09). The results of this study will be helpful for predicting mangrove forest status and its responses under climate changes.