Maggie 's first word spoken in the normal television show of the series happened in `` Lisa 's First Word '' , when she was voiced by Elizabeth Taylor and says `` Daddy '' in an empty room . Although she had previously spoken in fantasies and dream sequences , Maggie 's first word spoken in the normal continuity of the series occurred in `` Lisa 's First Word '' , when she was voiced by Elizabeth Taylor . Although it was only one word ( `` Daddy '' ) , Taylor had to record the part numerous times before the producers were satisfied .