Conspiracy is a 1930 American pre-Code mystery melodrama film produced and distributed by RKO Pictures and directed by Christy Cabanne.

It is the second adaptation of the play The Conspiracy by Robert B. Baker and John Emerson and stars Bessie Love and Ned Sparks.

After their father is killed, brother and sister Margaret and Victor Holt devote themselves to bringing down the drug gang responsible for his death.

When Morton discovers Margaret's true identity, he contrives a plot to lure her brother into a trap and kill him.

In hiding, she becomes friends with a mystery author, Winthrop Clavering, and a reporter, John Howell, the truth about the murder is revealed, and it is discovered that Victor was not killed, but is being held prisoner by the drug ring.