Juliet disobeys her father in Act 3 Scene 5, specifically in lines 121-123, when he tells her that she will be married to Paris on Thursday, and she responds by saying "Now, by Saint Peter's Church and Peter too, / He shall not make me there a joyful bride! / I wonder at this haste; that I must wed / Ere he that should be husband comes to woo."
In the play "Romeo and Juliet," Juliet disobeys her father's wishes to marry Paris in Act 3, Scene 5, specifically in lines 126-128. In this scene, Juliet's father, Lord Capulet, arranges her marriage to Paris, but she refuses and declares her love for Romeo instead.