Trinummus is a comedic Latin play by the early Roman playwright Titus Maccius Plautus.
The play opens with a Prologue delivered by the goddess Extravagant Living (Luxuria) and her daughter Poverty (Inopia).
Meanwhile the young man Lysiteles, who lives next door, tells his father Philto that he wishes to marry Charmides' daughter, without receiving a dowry, since he is anxious to help Lesbonicus.
Callicles likes the idea, but fearing that Lesbonicus will claim the treasure for himself if he hears about it, he devises a plan to dress up an imposter in Syrian costume for three coins (Latin trinummus) and make him pretend that he has been sent bringing dowry money from Charmides.
In Plautus's plays a common pattern is to begin each section with iambic senarii (which were spoken without music), then one or more passages of music in various metres, and finally a passage in trochaic septenarii, which were apparently sung or recited to the accompaniment of tibiae (a pair of reed pipes).