Bailly may refer to:

• Jean Sylvain Bailly (1736-1793), French astronomer and orator, one of the leaders of the early part of the French Revolution
• Sandrine Bailly (born 1979), French biathlete
• Bailly (crater), a lunar crater

Bailly is the name or part of the name of several communes in France:

• Bailly, Oise
• Bailly, Yvelines
• Bailly-aux-Forges, in the Haute-Marne département
• Bailly-en-Rivière, in the Seine-Maritime département
• Bailly-le-Franc, in the Aube département
• Bailly-Romainvilliers, in the Seine-et-Marne département

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