This investigation was performed to know the effect of accelerated aging and seed priming on viability of sunflower seeds. Treatments included three periods of accelerated aging (0, 3 and 6 days) under 41°C and 100% humidity and eleven seed priming treatments [Unprimed seeds (control),  Distilled water (hydropriming), (25 mM, 50 mM and 75 mM CaCl₂), (500 ppm, 1000 ppm and 1500 ppm Salicylic acid [SA]) and ( 25%, 50% and 75% Yeast) ]. A completely randomized design with three replications was used in A factorial experiment. germination percentage (%), mean germination time (MGT), germination index (GI), day germination speed, electrical conductivity (E.C), radical length, seedling dry weight,  plumule length, seedling vigor index and seedling growth rate were studied in this investigation. The results showed that, responses of different parameters to aging periods and seed priming treatments were significantly different in all studied traits. With increasing aging duration, there was a reduction in all studied traits except for only mean germination time, day germination speed and electrical conductivity which were increased with increasing aging period. Results also, showed that hydropriming and seed pretreatment with (50 mM CaCl₂, 100 ppm Salicylic acid and 50% yeast) were better than other treatments in all traits under this study. Therefore, this investigation recommended with using these treatments to increase viability of sunflower seeds specially after aging stress.