Robert Garnier (1544 – 20 September 1590) was a French tragic poet. He published his first work while still a law-student at Toulouse, where he won a prize (1565) in the Académie des Jeux Floraux. It was a collection of lyrical pieces, now lost, entitled Plaintes amoureuses de Robert Garnier (1565). After some legal practice at the Parisian bar, he became conseiller du roi au siege présidial and sénéchaussé of Maine, his native district, and later lieutenant-général criminel. His friend Lacroix du Maine says that he enjoyed a great reputation as an orator. He was a distinguished magistrate, of considerable weight in his native province, who gave his leisure to literature, and whose merits as a poet were fully recognized by his own generation.
In his early plays he was a close follower of the school of dramatists who were inspired by the study of Seneca. In these productions there is little that is strictly dramatic except the form. A tragedy was a series of rhetorical speeches relieved by a lyric chorus. His pieces in this manner are Porcie (published 1568, acted at the Hôtel de Bourgogne in 1573), Cornélie and Hippolyte (both acted in 1573 and printed in 1574). In Porcie the deaths of Cassius, Brutus and Portia are each the subject of an eloquent recital, but the action is confined to the death of the nurse, who alone is allowed to die on the stage. His next group of tragedies Marc-Antoine (1578), La Troade (1579), Antigone (acted and printed 1580) shows an advance on the theatre of Étienne Jodelle and Jacques Grévin, and on his own early plays, in so much that the rhetorical element is accompanied by abundance of action, though this is accomplished by the plan of joining together two virtually independent pieces in the same way. In 1592 The Countess of Pembroke wrote The Tragedy of Antonie, an English version of Garnier's play.