Where is the potions section in library Harry Potter and order of phoenix?

There is no potions section specifically mentioned in the library of Hogwarts in Harry Potter and the Order of the Phoenix. The library is vast and contains a multitude of sections, but a potions section is not specifically addressed in the book.

However, the book does mention that the library houses a wide variety of books, including those on subjects like magic, history, and even "dark arts," which might include books on potions. It's highly likely that potions-related books are found within the library, but not necessarily in a designated section.