Biff Diggerence (born Bernard Werner Diggerence) is a character in The Broom of the System. He is from Shillington, Pennsylvania.

Biff was one of the two visitors at Clarice Beadsman's dorm room on the night in 1981 that Lenore visited Mount Holyoke.

Biff was a student at Amherst College, where he roomed with Andrew Lang and Doug Dangler. Biff began an Amherst tradition of banging one's head against a wall to try and prevent becoming sick from drinking too much alcohol.