Tour Voltaire, Office building in Puteaux, France.

Tour Voltaire is an 82-metre office tower in Puteaux, La Défense, split into two adjoining buildings open across their floors: one has 18 levels and a technical terrace, the other 23 levels and a technical terrace. Its light grey facades are covered by a regular grid of small square windows, and the upper part of the lower tower carries the lettering "MORGAN STANLEY".

Tour Voltaire was built in 1988, the year given by the Basque Wikipedia article, and rises 82 metres in the La Défense business district on the territory of Puteaux. Over time it housed services of the Ministry of the Environment and the headquarters of the Bureau d'enquêtes sur les événements de mer (BEAmer). Since December 2018 the Groupe Indigo has had its head office there, followed by Louvres Hôtel in 2019 and Worldline in 2021.

The tower's name refers to Voltaire, the 18th-century writer, though the building itself dates from 1988. Its two joined blocks are open between floors, and the taller one carries the name "MORGAN STANLEY" in vertical lettering near its roofline, a mark of the finance firms that have occupied La Défense.

Tour Voltaire stands in the La Défense business district on the territory of Puteaux, reached by metro, RER or tram from central Paris. The two connected towers share open floor plates, so the 18-level and 23-level sections link internally. The site is an active corporate address, with Groupe Indigo's head office since December 2018 and Worldline since 2021.

The structure consists of two separate yet connected buildings of different heights, with one section rising to 18 floors and the other reaching 23 levels.