Flitwick's Office

• Type: Professor's office, temporary prison
• Location: Seventh floor, near the base of the West Tower, Hogwarts Castle
• Owner/Residents: Filius Flitwick; Sirius Black was briefly imprisoned here.
• Key Features: A tidy office with furniture scaled to Professor Flitwick's small size. Its window is specifically identified as the thirteenth from the right of the West Tower.

Professor Flitwick's office is the personal study of the Charms Master and Head of Ravenclaw House, Filius Flitwick. Located on the seventh floor of Hogwarts Castle, its precise position is near the base of the West Tower. The interior of the office is described as being very tidy. When Harry Potter is taken there in his second year, he notes that everything, including the desk and chair, seems to be sized for a very small person, accommodating Professor Flitwick's diminutive stature. The office's door can be magically secured, as Albus Dumbledore later claimed he had to “blast his way” inside to find it empty after Sirius Black's escape. The office's single window is its most significant feature, playing a crucial role in the events at the end of Harry's third year.

The office features in two key moments in the series:

• Harry Potter and the Chamber of Secrets: After Harry Potter tracks mud into the castle, he is caught by Argus Filch. Percy Weasley intervenes and, finding Professor McGonagall's study vandalized by Peeves, takes Harry to Flitwick's office instead to await her. This provides the first and only physical description of the office's interior.
• Harry Potter and the Prisoner of Azkaban: The office serves as a makeshift cell for Sirius Black after he is captured by Severus Snape. Albus Dumbledore ensures Sirius is held here rather than being handed over to the Dementors. He then subtly guides Harry Potter and Hermione Granger to use the Time-Turner to rescue him. While Snape guards the door and Cornelius Fudge is distracted by Dumbledore, Harry and Hermione fly Buckbeak the Hippogriff up to the office's window—the thirteenth from the right of the West Tower—and help Sirius escape from Hogwarts.

Professor Flitwick's office appears to be a single room. The books do not describe any anterooms, storerooms, or other adjacent areas connected to it. It primarily contains his desk and chair.

In the film adaptation of Harry Potter and the Prisoner of Azkaban, the location of Sirius's imprisonment is changed. Instead of being held in Flitwick's office, he is locked away at the top of the Dark Tower. This change creates a more dramatic setting for the rescue scene with Buckbeak. (film)