The Eiffel Tower is a world-famous landmark located in the Muggle city of Paris, France. Constructed by Muggles as the centerpiece of the 1889 World's Fair, it holds no inherent magical properties and is not mentioned at any point in the original seven Harry Potter novels. Its existence within the wider Wizarding World is acknowledged in supplementary materials, where it serves as a major geographical marker for Paris. The city is home to a significant magical community, including the French Ministry of Magic (Ministère des Affaires Magiques de la France) and was a key location during Gellert Grindelwald's global wizarding war.
The Eiffel Tower plays no role in the main narrative concerning Harry Potter. Its significance is confined to establishing the setting in related media. In 1927, the tower was a prominent feature of the Parisian skyline when Newt Scamander traveled to the city to track down Credence Barebone and confront Gellert Grindelwald. The magical Circus Arcanus was located in a square near the tower during this time (Fantastic Beasts: The Crimes of Grindelwald).
There are no known magical areas, hideouts, or establishments located within the Eiffel Tower itself.
The only appearance of the Eiffel Tower within the Wizarding World franchise is in the film The Crimes of Grindelwald. It is featured in several establishing shots to clearly identify the film's primary setting as Paris and to ground the magical events within a recognizable Muggle environment.