Monsieur Allard, a former MSP and MEP, has said he wants to focus on tackling poverty.
The French-born councillor also said making Aberdeen a world leader in tackling climate change was another objective.
RT @BBCNorthEast: Christian Allard appointed co-leader of Aberdeen City Council - BBC News https://www.bbc.co.uk/news/uk-scotland-north-east-orkney-shetland-65684317
🐦🔗: https://n.respublicae.eu/Christia_Allard/status/1661085379687006241