蔡濯堂（1918年6月10日──2004年6月8日），筆名思果，係中國作家。佢係江蘇鎮江人，天主教徒。晚年旅居美國北卡羅萊納州馬修城嘅曉霧裏（Misty Dawn Lane）。
Cai Yuntang (June 10, 1918 – June 8, 2004), pen name Siguo, was a Chinese writer. He is a native of Zhenjiang, Jiangsu, and a Catholic. In his later years, he lived in Misty Dawn Lane, North Carolina, United States.