William Sharp McKechnie (1863–1930) was a Scottish historian and scholar, recognized for his extensive contributions to legal and constitutional history. Born in Paisley, Scotland, McKechnie initially pursued law, later transitioning to academia where he became a respected authority in British legal history. His work focused on translating complex legal documents and historical events into accessible language, which made him a well-regarded figure among scholars and legal historians alike.

In addition to Magna Carta: A Commentary on the Great Charter of King John, McKechnie authored works that highlighted the evolution of British legal structures and the role of historical documents in the development of democracy. His ability to connect historical context with legal interpretation made his scholarship invaluable, and his writings continue to serve as foundational texts for students and researchers in constitutional studies.