A injection valve assembly includes a valve body having a central longitudinal axis and a cavity with a fluid inlet portion and a fluid outlet portion, a valve needle axially movable in the cavity between a closing position that prevents a fluid flow through the fluid outlet portion and further position that release the fluid flow, an electro-magnetic actuator unit that actuates the valve needle and includes an armature that is axially movable in the cavity and which includes a main body and a hydraulic damper fixedly coupled to the main body. The hydraulic damper includes an inner surface facing the main body and arranged for contact with the valve needle. The hydraulic damper also has a first opening and second opening (s), wherein the valve needle extends through the first opening, and the second opening (s) provide a fluid passage from the fluid inlet portion to the fluid outlet portion.