 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 . James Earl Jones voiced Maggie in " Treehouse of Horror V " . Maggie would later have brief dialogue in " Treehouse of Horror IX " , voiced by Harry Shearer , who used his Kang voice . In earlier episodes , <unk> Smith did many of Maggie 's <unk> , cries , laughs and occasional speaking parts , although in the later seasons her parts are done by Nancy Cartwright ( including a single word spoken during the end credits of The Simpsons Movie ) . <unk> Foster voiced a Howard <unk> @-@ inspired Maggie in the season 20 episode " Four Great Women and a <unk> " . 
