Byrhtferth (c. 970 – c. 1020) is a priest and monk who lives at Ramsey Abbey.

He has a deep impact on the intellectual life of later Anglo-Saxon England and writes many computistic, hagiographic, and historical works.

He is a leading man of science and best known as the author of many different works (although he may not have written many of them).

His Manual (Enchiridion), a scientific textbook, is Byrhtferth's best known work.

He studies with Abbo of Fleury, who is invited to Ramsey Abbey by Oswald of Worcester to help teach.

Abbo is there during the period 985-987, and becomes a large influence on Byhrtferth, who is interested in the same studies, such as history, logic, astronomy, and mathematics.

We do not have contemporary biographies of Byrhtferth, and the only information we have is the one in his Manual and his Preface.