Armando Dippet is the Hogwarts headmaster before Albus Dumbledore in J.K. Rowling’s Harry Potter series.
Dippet appears primarily through memories and historical references rather than as an active character in the main story. He was headmaster when Tom Riddle attended Hogwarts and when the Chamber of Secrets was opened during Riddle’s school years.
Riddle manipulated events so that the attacks appeared connected to another student, eventually causing Dippet to close the school temporarily. Dumbledore, who taught Transfiguration at the time, was more suspicious of Riddle and later became headmaster.
Armando Dippet is often confused with other former Hogwarts headmasters. Phineas Nigellus Black is another historical headmaster, while Minerva McGonagall serves as headmistress later in the series. Dippet’s role is particularly important because his tenure overlaps with the origins of Voldemort’s school-era history.