The thermal response of long Jute and Banana reinforced epoxy natural composites has been investigated. The materials systems used for the investigation are : Epoxy (EP), Epoxy/4 wt.% Banana fiber (BF)/4 wt.% Jute fiber (JF) (EP8), Epoxy/8 wt.% BF/8 wt.% JF (EP16), Epoxy/12 wt.% BF/12 wt.% JF (EP24), and Epoxy/16 wt.% BF/16 wt.% JF (EP32). These composites were processed and fabricated using hand – lay-up technique. The thermal response of the aforesaid material systems were studied using thermogravimetric analysis (TGA). The % weight loss of these composites at defined temperature has been recorded from the thermograms. The hybridization effect of long jute and banana fibers on the thermal stability of epoxy fibrous composites were investigated. It is revealed from the experimentation that higher loading of natural fibers has enhanced the thermal stability of composites. The percentage weight loss of these composites has been controlled at higher thermal load using the combined effect of natural fibers. Keywords:- Thermal; Jute Fiber; Banana Fiber; Epoxy; Natural Composites.