This study aimed to evaluate the antioxidants concentration and antimicrobial activities of the different crude extracts of egg strings from sea hare (Dolabella auricularia) taken from Guangguang, Pujada Bay, Davao Oriental. The determination of phenolics using the Aluminum chloride colorimetric method yielded 0.01 – 0.17 mg gallic acid equivalent / gram. On the other hand, Folin-ciocalteau assay for the total flavonoids gave a range of 6.27 – 8.83 mg quercetin/ gram. Furthermore, the antibacterial activity assay using the agar disk diffusion method gave a promising zone of inhibition for ethyl acetate extract against Staphylococcus aureus and Escherichia coli (20 mm and 26.56 mm, respectively). The findings of this work may add to the overall value of the nutritional and medicinal potential of the egg strings from sea hare.