As originally reported by Code Hospitality, the restaurant was shuttered in October as its 10-year contract ended.
In a statement, the hotel said the Covid-19 pandemic has impacted business levels, which has had an adverse effect on operations.
“Mandarin Oriental Hyde Park, London appreciates the patronage given to the establishment over the past ten years and would like to thank Chef Boulud and the exceptional colleagues who brought the creative concepts to London and made the restaurant a Knightsbridge neighbourhood favourite,” the statement continues.
The high profile French chef launched Bar Boulud in 2010 as a sister restaurant to his New York restaurant of the same name.
The restaurant served rustic French bistro-inspired dishes, and was best-known for its house-made terrines, pâtés and foie gras-stuffed burgers.
Trained in France under Georges Blanc and Michel Guerard, Boulud currently operates seven restaurants in New York including his two-star flagship Daniel as well as six further restaurants elsewhere in the US and overseas.