A eunuch who served King Ahasuerus of Persia as a palace guard. He and a fellow guard named Teresh planned an assassination attempt on the king’s life. When their plot was overheard by Queen Esther’s uncle Mordecai, Bigthan and Teresh were executed (Esther 2:21–23). Bigthan is called “Bigthana” in Esther 6:2.
See also Bigtha.