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 first floor corridor. Inside the left Bell Tower is Filch's Office.

The Central Tower is one of the three main towers in the castle and it overlooks the Viaduct Entrance.

The Clock Tower doesn't begin at the Ground Floor level. Because it's placed on top of a hill, the Tower begins at the Third Floor level. When you enter the Tower, there's a huge space, like an Entrance Hall with flights of wooden stairs at the right and left side. The first landing is at the Fourth Floor level. It's at this landing that are the clock's gears and face. A long corridor with an entrance to the Hospital Wing is at this landing. This same corridor connects the Tower to the remaining castle. If you go up another flight of wooden stairs, you will get to another landing, this time at the Fifth Floor level. It's in this landing that are the clock's bells; some massive gold and copper bells. There is another corridor at this landing; like the other, it links the Tower to the main castle.

The Dark Tower overlooks the Transfiguration Courtyard. At the top of the tower is a small cell where Sirius Black was held in 1994, before he was to receive the Dementor's Kiss. (This tower only appears in the film adaptations of Prisoner of Azkaban and Goblet of Fire, and was replaced by the Astronomy Tower in Half-Blood Prince.)

The Defence Against the Dark Arts Tower overlooks the Suspension Bridge. The contents of this tower remained even though the tower was deleted in Harry Potter and the Half-Blood Prince.

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. A circular hole is behind the painting, leading to the Common room, which is a circular room where Gryffindor students can relax after a long day of studying. The Common room is full of squashy armchairs, tables, and a bulletin board where school notices, ads, lost posters, etc. can be posted. A window looks out onto the grounds of the school, and a large fireplace dominates one wall.

The Common room is usually where celebration parties are held after Gryffindor Quidditch victories, or when Harry Potter completed a task for the Triwizard Tournament. It was also the location for Harry and Ginny Weasley's first kiss following Gryffindor's Quidditch Cup victory in 1997. The Common room fireplace was used on several occasions by Sirius Black to contact Harry while he was on the run from the Ministry of Magic.

The Gryffindor dormitories are also located in the Tower, with two doors leading off from the Common room that open to spiral staircases. One of them leads to the girls dormitory, the other to the boys. The stairs to the girls dormitories are enchanted to become a slide if any boy attempts to climb them, but not vice versa, since it was deemed that girls were more trustworthy than boys.

The Headmaster's office is located within this tower. Prior to 1995, the entrance was located on the second floor. However, this changed to the Seventh Floor sometime before the 1996–1997 school year. 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 North Tower is one of the many towers in the castle. The tower is the location for Divination classes and the Divination teacher's office. The entrance consists of a ladder leading through a trap door.

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. The entrance to the room is at the top of a spiral staircase, and is a door without doorknob or keyhole but a bronze knocker in the shape of an eagle. In order to enter the room, you must answer a question asked by the eagle knocker; if you answer wrong, you must wait for someone who gets it right.