The aim of the present research is to investigate the hot workability behavior of AISI 303Se stainless steel in both cast and worked conditions. To this end, the AISI 303Se stainless steel was produced using an induction furnace and subjected to homogenization, dissolution, and annealing heat treatments within the temperature range of 1000 to 1200 °C. Samples of both cast and worked steel were cut for tensile testing at temperatures ranging from 900 to 1200 °C. Optical microscopy and tensile testing were employed to examine the microstructure and mechanical properties, respectively. The results of the microscopic tests indicated that heat treatment and hot rolling reduced the average grain size of the steel from 70 µm to approximately 25 µm. The heat treatment and rolling led to a reduction in the high-temperature strength of AISI 303Se stainless steel by about 38%. However, the implementation of heat treatment and hot rolling increased the ductility of the AISI 303Se stainless steel by approximately 36%. The Desiarble temperature for hot working of cast AISI 303Se stainless steel was found to be 1100 °C, while for worked AISI 303Se stainless steel, it was in the range of 1050-1100 °C. In both types of steel, whether cast or worked, complete recrystallization occurred at 1050 °C; however, recrystallization in the worked steel resulted in a finer-grained structure and consequently a wider hot working window.