Coquilles de Reims, University amphitheaters at Reims-Champagne-Ardenne campus, France.

The Coquilles de Reims are six shell-shaped lecture halls arranged around a central courtyard with a combined capacity of roughly 2,700 people. Each building uses inverted scallop forms with wooden ribs and plywood panels supported by concrete and steel frames, with sizes ranging from 200 to 700 seats.

The complex was built between 1970 and 1974 by architects André and Denis Dubard de Gaillarbois with Robert Clauzier. The project introduced innovative laminated wood construction techniques that were groundbreaking for the period.

The name comes from the inverted scallop-shell shape of the six lecture halls, grouped around a circular patio. Today they serve the UFR Lettres et Sciences Humaines for lectures and also host students of the Law and Political Science and Economics, Social and Management faculties. The complex received the label "Patrimoine du XXe siècle" in 2012.

The complex is best explored on foot with plenty of open space to walk around all six buildings and the central courtyard. Note that the halls may have restricted access during teaching hours, so early morning or between sessions is often better for visitors.

The 2005-2006 restoration replaced everything except the shells themselves, so the timber you see is the original 1970s work. A 2004 ground subsidence in the Croix-Rouge district had raised concerns about soil stability before the reinforcement. The six halls hold 2,700 seats in total: one of 700, two of 600, two of 300 and one of 200.