Anticancer potential of methanol extracts of seagrass and taurine was proven through cytotoxic and antiproliferation tests by MTT method (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) on HeLa cervical cancer cell culture. The results showed that the methanol extract of seagrass had a cytotoxic activity with IC50 values are 122 ppm. While the doubling time value in the antiproliferation test by methanol extracts of seagrass and taurine showed higher values than cell control (72.19 hours).