John Lord was an American historian and lecturer best known for Beacon Lights of History, a wide-ranging series that introduces the past through influential people and ideas. His writing connects rulers, thinkers, religious leaders, and artists with the societies they helped shape. It presents history as a sequence of vivid lives and consequential choices.

Born in Portsmouth, New Hampshire, Lord studied at Dartmouth College and Andover Theological Seminary. After work connected with the American Peace Society and Congregational churches, he devoted himself to public lecturing and writing. He spoke extensively in the United States and England and also lectured on history at Dartmouth, developing an approach suited to listeners as well as readers.

His books include The Old Roman World, Ancient States and Empires, and a biography of the educator Emma Willard. Beacon Lights of History became the fullest expression of his interest in interpreting civilization through notable individuals. His judgments reflect the religious and cultural outlook of his period, and modern readers may question their emphases. Nevertheless, his clear organization and energetic narrative preserve the appeal of the nineteenth-century historical lecture.