Poetaster is a late Elizabethan satirical comedy written by Ben Jonson that was first performed in 1601. The play formed one element in the back-and-forth exchange between Jonson and his rivals John Marston and Thomas Dekker in the so-called Poetomachia or War of the Theatres of 1599–1601.

Poetaster was entered into the Stationers' Register on 21 December 1601, and was first published in quarto in 1602 by the bookseller Matthew Lownes. The title page of the first edition states that the play was performed by the Children of the Chapel, one of the companies of boy actors popular at the time. The play was next published in the first folio collection of Jonson's works (1616). A prefatory note to the folio text identifies the main actors in the 1601 production as Nathan Field, John Underwood, Salomon Pavy, William Ostler, Thomas Day, and Thomas Marton. The quarto and folio texts both supply subtitles, with slight variants: in the quarto, the title is Poetaster or The Arraignment, and in the folio, Poetaster, Or His Arraignment.