An adjustable headrest for an aircraft seat including a headrest configured to simultaneously horizontally translate and rotate relative to a seatback, an actuating element that urges against the seatback to drive the simultaneous horizontal translation and rotation of the headrest, and linkage interconnecting the headrest with the actuating element and driving movement of the headrest in response to movement of the actuating element. An aircraft passenger seat including an adjustable headrest configured to horizontally translate and rotate relative to the seatback.