Charles de Batz de Castelmore, also known as d'Artagnan and later Count d'Artagnan, was a French Musketeer who served Louis XIV as captain of the Musketeers of the Guard. He died at the siege of Maastricht in the Franco-Dutch War. A fictionalised account of his life by Gatien de Courtilz de Sandras formed the basis for the d'Artagnan Romances of Alexandre Dumas père, most famously including The Three Musketeers (1844). The heavily fictionalised version of d'Artagnan featured in Dumas' works and their subsequent screen adaptations is now far more widely known than the real historical figure.

A musketeer was a type of soldier equipped with a musket. Musketeers were an important part of early modern warfare, particularly in Europe, as they normally comprised the majority of their infantry. The musketeer was a precursor to the rifleman. Muskets were replaced by breech loading rifles as the almost universal firearm for modern armies during the period 1850 to 1870. The traditional designation of "musketeer" for an infantry private survived in the Imperial German Army until World War I.