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In this study, five macroalgae and four microalgae in addition to seven Cyanophycean, blue-green algae, were isolated from different environmental habitats. The ability of these species for bioethanol and biodiesel production was assessed. Five techniques were examined for cell wall disruption, namely thermic shock, manual grinding, acid, base, and enzymatic digestion. Among these methods, sulfuric acid (3%) achieved the highest reducing sugar yield (%) followed by the enzymatic then the base hydrolysis methods. For each species, the resulted yield of reducing sugars (%) was dependent on the hydrolysis method rather than on the quantity of the total sugars (as mg/100 mg dr weight). After 48 hours of fermentation, Arthrospira platensis, Chlorella marina, and Ulva linza proved to be promising for bioethanol production estimating 45.49%, 23.24%, and 12.01% as ethanol yield, respectively. For all the tested …