Henri Desmarets (February 1661 – 7 September 1741) was a French composer of the Baroque period primarily known for his stage works, although he also composed sacred music as well as secular cantatas, songs and instrumental works.
Henri Desmarets was born into a modest Paris household in February 1661. His mother, Madeleine née Frottier, came from a bourgeois Parisian family. His father, Hugues Desmarets was a huissier in the cavalry at the Grand Châtelet. Desmarets' childhood was marked by his father's death when he was eight years old, his mother's subsequent re-marriage in 1670, and the death of his two siblings. In 1674, he entered into the service of King Louis XIV as a page and choir singer in the Chapelle Royale (Chapel Royal). According to Duron and Ferraton, he may have also previously sung as a choir boy in Saint-Germain l'Auxerrois which was the parish church of the kings of France. While in the service of the king, he received a general education as well as music training from Pierre Robert and Henry Du Mont. He is also thought to have received training from the court composer Jean-Baptiste Lully, who used the chapel pages as performers in his operas. By 1680 he had become an "ordinaire de la musique du roi" (court musician) and had composed the first of his grand motets (Te Deum 1678). The idyll-ballet which he composed in August 1682 to celebrate the birth of the king's grandson, the Duke of Burgundy, found great favour at court and the following year he entered the competition to select four maîtres (masters) of the Chapelle Royale. He was only 22 at the time and according to some accounts, the King had vetoed his selection after he had passed the first round on account of his youth.