Four lignans, meso-dihydroguaiaretic acid (DHGA), macelignan, fragransin $A_2$ and nectandrin B, were isolated from the seeds of Myristica fragrans (Vietnamese nutmeg) and investigated for their cytotoxic activity against eight cancer cell lines. Of these, DHGA exhibited potent cytotoxicity against H358 with $IC_{50}$ value of $10.1{mu}M$. In addition, DHGA showed antitumor activity in allogeneic tumor-bearing mice model.