James Bowdoin II was an American political and intellectual leader from Boston, Massachusetts, during the American Revolution and the following decade. He initially gained fame and influence as a wealthy merchant. He served in both branches of the Massachusetts General Court from the 1750s to the 1770s. Although he was initially supportive of the royal governors, he opposed British colonial policy and eventually became an influential advocate of independence. He authored a highly political report on the 1770 Boston Massacre that has been described by historian Francis Walett as one of the most influential pieces of writing that shaped public opinion in the colonies.

The Boston Massacre was a confrontation in Boston on March 5, 1770, in which nine British soldiers shot several of a crowd of three or four hundred who were harassing them verbally and throwing various projectiles. The event was heavily publicized as "a massacre" by leading Patriots such as Paul Revere and Samuel Adams. British troops had been stationed in the Province of Massachusetts Bay since 1768 in order to support crown-appointed officials and to enforce unpopular Parliamentary legislation.