The Champ de Mars is a vast public area in Paris, France, located in the 7th arrondissement, between the Eiffel Tower to the northwest and the École Militaire to the southeast. Its name means "Field of Mars", from Mars the Roman god of war, because it was originally used for military training.

The Champ de Mars formed the setting of a massacre during the French Revolution on July 17, 1791. When a crowd collected to draft a petition seeking the removal of King Louis XVI, soldiers under the command of the Marquis de la Fayette opened fire, killing about 50 people.

The Champ-de-Mars is a public park in Montreal. Formerly a military parade ground, it is located in front of Montreal City Hall. It contains remnants of Montreal's fortifications.

Champ-de-Mars is the name of a metro station located near this park.