Effector may refer to:
Effector (biology), a molecule that binds to a protein and thereby alters the activity of that protein Effector (album), a music album by the Experimental Techno group Download EFFector, a publication of the Electronic Frontier Foundation
See also Effexor, a brand name for the antidepressant venlafaxine Bacterial effector protein, proteins secreted by bacterial pathogens into the cells of their host Effector cell End effector, the device at the end of a robotic arm Affect (disambiguation)