Results: Four lignans (lingueresinol (1), (+) - isolariciresinol 9'-O-β-D-glucopyranoside (2), (+) - isolariciresinol (3) and (-) - isolariciresinol 9'-O-β-D-glucopyranoside (4)) were isolated and indentified the chemical structures from the ethyl acetate extract of leaves of Sonneratia ovata.