The Astronomy Tower is the tallest tower at Hogwarts Castle surrounded by a parapet and turret. It is where students study the stars and planets through their telescopes in Astronomy lessons. The tower is usually out-of-bounds except for classes. The entire Astronomy department, and the Professor's living quarters can be found here.

The Bell Towers are two towers that rise over the main entrance to the Herbology Greenhouses. Between the two towers are a set of double wooden doors which lead along the Ground Floor Corridor.

The Headmaster's office is located within this tower. To gain entrance, a password must be given to a stone gargoyle, which will move aside at the correct password to reveal a spiral staircase with moving steps. The office is a circular room with windows, decorated with portraits of previous Headmasters including Dilys Derwent and Phineas Nigellus Black. Many magical instruments are kept here, such as the Sorting Hat and the Pensieve.

The Ravenclaw Tower is located on the west side of Hogwarts, the staircase leading up to the common room is presumably located on the fifth floor, and is the location of the Ravenclaw common room and dormitories.

Gryffindor Tower is located behind the portrait of the Fat Lady on the Seventh Floor of Hogwarts Castle. A Password is required to enter it, which is spoken to the portrait, and inside it houses the Gryffindor Common Room and Dorms.

The Clock Tower is one of the older features of Hogwarts Castle. Within the tower, lies the mechanism that run the antique clock. There is an old courtyard at its base, and at the top is the clear glass dial of the clock. There is space between the clock's movement and the dial for a person to either repair the clock or to stand and look out over the courtyard.