A needle assembly (1, 100, 200) for mounting on an injection device comprising: a body configured to be removably attached to an injection device in use; a double ended needle (40, 140, 240) supported by the body and extending from a forward tip which faces forwardly relative to the body to a rearward tip which faces rearwardly relative to the body; the needle assembly (1, 100, 200) comprising: a manually operable needle shield (30, 130, 230) coupled to the body and arranged for relative axial movement with respect to the body, the needle shield comprising an actuator portion (31, 131, 231) on the outer surface thereof configured, in use, to allow the shield (30, 130, 230) to be pushed forward manually, wherein the needle assembly (1, 100, 200) has an injection configuration, in which the shield (30, 130, 230) is positioned such that the forward tip of the needle (40, 140, 240) projects beyond a forward end of the shield (30, 130, 230), and a shroud configuration, in which the shield (30, 130, 230) is positioned such that the forward end of the shield (30, 130, 230) extends beyond the forward tip of the needle (40, 140, 240); and the needle assembly (1, 100, 200) further comprises a needle support (50, 150, 250) fixed to the needle (40, 140, 240); the needle support (50, 150, 250) and body being provided with cooperating features (54,154a, 253; 15, 113a, 260) such that the needle support (50, 150, 250) is fixed relative to the body when the needle assembly (1, 100, 200) is in the injection configuration and wherein the shield (30, 130, 230) and needle support (50, 150, 250) are provided with cooperating interconnecting features (35, 136, 237; 55, 152, 257) which control the relative position of the needle support (50, 150, 250) and shield (30, 130, 230) and which cooperating interconnecting features are provided such that movement of the shield (30, 130, 230) from the injection configuration to the shroud configuration axially displaces the needle support (50, 150, 250) forwardly relative to the body. a body configured to be removably attached to an injection device in use; a double ended needle (40, 140, 240) supported by the body and extending from a forward tip which faces forwardly relative to the body to a rearward tip which faces rearwardly relative to the body; the needle assembly (1, 100, 200) comprising: a manually operable needle shield (30, 130, 230) coupled to the body and arranged for relative axial movement with respect to the body, the needle shield comprising an actuator portion (31, 131, 231) on the outer surface thereof configured, in use, to allow the shield (30, 130, 230) to be pushed forward manually, wherein the needle assembly (1, 100, 200) has an injection configuration, in which the shield (30, 130, 230) is positioned such that the forward tip of the needle (40, 140, 240) projects beyond a forward end of the shield (30, 130, 230), and a shroud configuration, in which the shield (30, 130, 230) is positioned such that the forward end of the shield (30, 130, 230) extends beyond the forward tip of the needle (40, 140, 240); and the needle assembly (1, 100, 200) further comprises a needle support (50, 150, 250) fixed to the needle (40, 140, 240); the needle support (50, 150, 250) and body being provided with cooperating features (54,154a, 253; 15, 113a, 260) such that the needle support (50, 150, 250) is fixed relative to the body when the needle assembly (1, 100, 200) is in the injection configuration and wherein the shield (30, 130, 230) and needle support (50, 150, 250) are provided with cooperating interconnecting features (35, 136, 237; 55, 152, 257) which control the relative position of the needle support (50, 150, 250) and shield (30, 130, 230) and which cooperating interconnecting features are provided such that movement of the shield (30, 130, 230) from the injection configuration to the shroud configuration axially displaces the needle support (50, 150, 250) forwardly relative to the body. a manually operable needle shield (30, 130, 230) coupled to the body and arranged for relative axial movement with respect to the body, the needle shield comprising an actuator portion (31, 131, 231) on the outer surface thereof configured, in use, to allow the shield (30, 130, 230) to be pushed forward manually, wherein the needle assembly (1, 100, 200) has an injection configuration, in which the shield (30, 130, 230) is positioned such that the forward tip of the needle (40, 140, 240) projects beyond a forward end of the shield (30, 130, 230), and a shroud configuration, in which the shield (30, 130, 230) is positioned such that the forward end of the shield (30, 130, 230) extends beyond the forward tip of the needle (40, 140, 240); and the needle assembly (1, 100, 200) further comprises a needle support (50, 150, 250) fixed to the needle (40, 140, 240); the needle support (50, 150, 250) and body being provided with cooperating features (54,154a, 253; 15, 113a, 260) such that the needle support (50, 150, 250) is fixed relative to the body when the needle assembly (1, 100, 200) is in the injection configuration and wherein the shield (30, 130, 230) and needle support (50, 150, 250) are provided with cooperating interconnecting features (35, 136, 237; 55, 152, 257) which control the relative position of the needle support (50, 150, 250) and shield (30, 130, 230) and which cooperating interconnecting features are provided such that movement of the shield (30, 130, 230) from the injection configuration to the shroud configuration axially displaces the needle support (50, 150, 250) forwardly relative to the body.