Billy Barty, nascut William John Bertanzetti (Millsboro, Pennsilvània, 25 d’octubre de 1924 - Glendale, Califòrnia, 23 de desembre de 2000), va ser un actor i activista nord-americà. En la vida adulta, i a causa de la seva baixa estatura (feia 1,14m), sovint va aparèixer en pel·lícules enfront d'intèrprets més alts per obtenir un efecte còmic.

比利·巴蒂（Billy Barty，1924 年 10 月 25 日 - 2000 年 12 月 23 日出生于威廉·约翰·贝尔坦泽蒂）是美国演员和活动家。在成年后，由于软骨-毛发发育不全侏儒症，他身高 3 英尺 9 英寸（1.14 米），并且由于身材矮小，他经常在电影中与高个子表演者对戏以达到喜剧效果。他擅长直言不讳或睿智的角色。在 1950 年代，他成为电视明星，定期出现在斯派克琼斯合奏中。

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Billy Barty (born William John Bertanzetti, October 25, 1924 – December 23, 2000) was an American actor and activist. In adult life, he stood 3 feet, 9 inches (1.14 m) tall, due to cartilage–hair hypoplasia dwarfism, and because of his short stature he was often cast in movies opposite taller performers for comic effect. He specialized in outspoken or wisecracking characters. During the 1950s, he became a television star, appearing regularly in the Spike Jones ensemble.