Coyne et Bellier is a global consulting and engineering firm based in Gennevilliers, France.

They specialize in infrastructure projects such as dams, nuclear and hydroelectric power plants, roads, tunnels and other below-surface facilities.

The company was created by André Coyne and is a subsidiary of Tractebel, now part of Engie.

In the same year work was complete on two reactors at the Marcoule Nuclear Site in France along with the Yaté Dam in New Caledonia.

Coyne et Bellier was renamed Tractebel Engineering SA in 2009 but still operates under their original name and serves their parent's hydraulic sector.