羅孝全(I. J. Roberts, 1802-1871)爲十九世紀美國浸信會(American Baptist)來華傳教士，以其曾爲洪秀全的宗教導師及與太平天國的特殊關係而著名。1847年，羅孝全曾指導洪秀全研習基督教義，其間羅孝全對其印象頗佳，並認爲他所陳述之異象類似天使的感召。雖然洪秀全學道的時間僅有二月餘，但這些經驗對日後太平天國宗教的內涵與儀式，曾產生定程度的影響。本文首先將追溯羅孝全來華初期的傳教活動，並探索他對洪秀全在廣州學道期間的印象，以及對洪秀全在宗教方面的影響。

I. J. Roberts was an American Baptist missionary in China in 19th century. He was best known for his role as Hung Hsiu-chuan's religious teacher and his special relationship with the Taiping rebellion. Roberts instructed Hung in studying Christianity in 1847, and he had a good impression on Hung at that time. He also thought the visions that Hung mentioned were similar to angel's calling. Although Hung studied the gospel only for about two months, it had influenced the Taiping religion's comprehension and ceremony. This article will trace back to American Baptist missionary I. J Roberts' works in China during the early period, and analyzed his impression on the period of Hung Hsiu-chuan's research for gospel in Canton (Kuang-chou). Furthermore, Roberts' religious influence upon Hung Hsiu-chuan will be fully discussed.