Catherine MacGregor, (née Fiamma; born 7 August 1972)[2] is a French businesswoman and engineer.

[2] Her parents, both mathematics teachers with Corsican and Basque roots, raised her in Casablanca until she was 14.

[2][6] The board of the French energy company Engie named her as the next CEO on 2 October 2020, and she assumed the position on 1 January 2021.

The French Finance Minister, Bruno Le Maire, described it as 'regrettable' that more women were not in similar positions alongside her.

[6] She was awarded the "Chevalier de la Légion d'Honneur" (Knight of the Legion of Honour) on December 30, 2020, in recognition of her role as the CEO of an energy industrial group and her 25 years of service.