Henry Hedworth is chiefly notable for being the first person in the English language to introduce Latin (and Dutch) term "Unitarian" into print in England 1673, fourteen years before Stephen Nye of Hertfordshire became the first to use the word on a title page when he anonymously published Brief History of the Unitarians also called Socinians in 1687 (expanded 1691). The term was already found in private letters, since the term "Unitarian" was already known in England from works such as the Bibliotheca Fratrum Polonorum quos Unitarios vocant (catalogued "post A.D. 1656", in fact 1668).
- 1694 Stephen Nye, Henry Hedworth Considerations on the explications of the doctrine of the Trinity
- 1672 The spirit of the Quakers tried, according to that discovery it hath made. Society of Friends
- Alexander Gordon (Unitarian) Henry Hedworth and the Early Unitarian movement in The Christian Life Vol.18 p400
- The Cambridge History of English and American Literature in 18 Volumes (1907–21). Volume X. The Age of Johnson. XVI. The Literature of Dissent. § 7. The spread of Arianism and the First Socinian Controversy.
- Herbert John McLachlan Socinianism in seventeenth-century England 1951 p299
- Sir Adolphus William Ward, Alfred Rayney Waller The Cambridge history of English literature, Volume 10 1913 Page 426