Horace Grant Underwood (19 July 1859 – 12 October 1916) was an American Presbyterian missionary, educator, and translator who dedicated his life to developing Christianity in Korea.

Underwood's descendants continued to develop Korean society, religion, politics and education for over one hundred years.

His grandson, Horace Grant Underwood II (1917–2004) who, among other notable achievements,[7] served as an interpreter in the Korean War armistice talks.

[8] His great-grandson, Horace Horton Underwood II (1942– ), served as a professor of English literature at Yonsei University.

[9] The New Brunswick Theological Seminary has an endowed chair in honour of Underwood for a professor specialising in Global Christianity and missions.