A door closer, including: an anchor assembly, including: a frame mounting plate which is fixable relative to a door frame; and an adjustor plate; and an actuator assembly for mounting within the thickness of a door leaf to move the door leaf between open and closed configurations relative to the door frame, the actuator assembly including an operating member coupled by a link to the adjustor plate and mounted for a range of movements between a fully retracted position, in which the anchor assembly is held adjacent the actuator assembly when the door leaf is in the closed configuration, and an extended position, in which the anchor assembly is in spaced relation to the actuator assembly when the door leaf is in the open configuration, the link being configured to extend from the adjustor plate along a first axis, the frame mounting plate is provided with one or more slot(s) (111, 118, 119), the or each slot (111, 118, 119) being elongated in a vertical direction along a second axis (B-B), the second axis being generally orthogonal to the first axis, wherein the adjustor plate includes a first part and a second part, the first part being attachable to a door frame and the second part being attachable to the frame mounting plate, one of the first part and the second part including an aperture (129a, 129b) for receiving an adjustment member which enables the distance between the frame mounting plate and the adjustor plate to be varied, and one of the first and the second part including a formation which enables adjustment of the position of the door leaf relative to the door frame in a direction parallel to the second axis (B-B). an anchor assembly, including: a frame mounting plate which is fixable relative to a door frame; and an adjustor plate; and an actuator assembly for mounting within the thickness of a door leaf to move the door leaf between open and closed configurations relative to the door frame, the actuator assembly including an operating member coupled by a link to the adjustor plate and mounted for a range of movements between a fully retracted position, in which the anchor assembly is held adjacent the actuator assembly when the door leaf is in the closed configuration, and an extended position, in which the anchor assembly is in spaced relation to the actuator assembly when the door leaf is in the open configuration, the link being configured to extend from the adjustor plate along a first axis, the frame mounting plate is provided with one or more slot(s) (111, 118, 119), the or each slot (111, 118, 119) being elongated in a vertical direction along a second axis (B-B), the second axis being generally orthogonal to the first axis, wherein the adjustor plate includes a first part and a second part, the first part being attachable to a door frame and the second part being attachable to the frame mounting plate, one of the first part and the second part including an aperture (129a, 129b) for receiving an adjustment member which enables the distance between the frame mounting plate and the adjustor plate to be varied, and one of the first and the second part including a formation which enables adjustment of the position of the door leaf relative to the door frame in a direction parallel to the second axis (B-B).