Catiline His Conspiracy is a Jacobean tragedy written by Ben Jonson. It is one of the two Roman tragedies that Jonson hoped would cement his dramatic achievement and reputation, the other being Sejanus His Fall (1603).
The play was first published in quarto in 1611 by the stationer Walter Burre, prefaced with commendatory verses by Francis Beaumont, John Fletcher, and Nathan Field. It was reprinted the 1616 folio of Jonson's works. The folio text states that Catiline was first performed in 1611 by the King's Men, and lists the cast as: Richard Burbage, John Heminges, Alexander Cooke, Henry Condell, John Lowin, John Underwood, William Ostler, Nicholas Tooley, Richard Robinson, and William Ecclestone.
As its title indicates, the play recounts the story of Catiline, the Roman politician and conspirator of the 1st century B.C.
Jonson was not the first playwright of his era to dramatize the story of Catiline. Stephen Gosson in his "School of Abuse" (1579) praised a play called Catiline's Conspiracies, which was acted by Leicester's Men at The Theatre sometime between 1576 and 1579. A Catiline (either Gosson's or another play, author unknown) was acted at the home of William Cecil, 1st Lord Burghley on 16 January 1588. In 1598 or 1599, the Diary of Philip Henslowe records an advance payment of 5 shillings to Henry Chettle, for a play titled Catiline's Conspiracy—though Chettle appears never to have completed writing it.