Port for a catheter for subcutaneous implantation into a patient, the port comprising: a housing, comprising at least one locking cavity, a cavity arranged in the housing for receiving a fluid, a needle-penetrable closure element placed on the housing and penetrable by a puncturing needle for accessing the cavity, a connector for connecting the catheter to the port, the connector having a shaft portion for receiving the catheter and a flow channel formed in the shaft portion and being in fluid connection with the cavity, and a fixing element for fixing the catheter on the connector, wherein the fixing element comprises a body portion, a clamping element protruding from the body portion along a fixing direction and at least one locking element formed on the body portion, wherein the at least one locking element protrudes from the body portion along the fixing direction and reaches into the at least one locking cavity, wherein in a preassembled state of the fixing element, the fixing element is preassembled on the housing of the port prior to placing the catheter on the corresponding connector of the port, wherein the at least one locking element is in positive-locking engagement with a first counter-locking element formed on the housing to hold the fixing element on the housing in the pre-assembled state, wherein in an assembled state of the fixing element the at least one locking element is in positive-locking engagement with a second counter-locking element formed on the housing to fix the fixing element with respect to the housing in the assembled state, and wherein the fixing element is movable with respect to the housing along the fixing direction for transferring the fixing element from the pre-assembled state into the assembled state, the clamping element comprises a clamping opening extending along the fixing direction, wherein the shaft portion at least in the assembled state of the fixing element reaches into the clamping opening, and the clamping element comprises a shoulder portion formed within the clamping opening, wherein in the assembled state of the fixing element the clamping element is configured to act onto the catheter by means of the shoulder portion to fix the catheter on the shaft portion of the connector. a housing, comprising at least one locking cavity, a cavity arranged in the housing for receiving a fluid, a needle-penetrable closure element placed on the housing and penetrable by a puncturing needle for accessing the cavity, a connector for connecting the catheter to the port, the connector having a shaft portion for receiving the catheter and a flow channel formed in the shaft portion and being in fluid connection with the cavity, and a fixing element for fixing the catheter on the connector, wherein the fixing element comprises a body portion, a clamping element protruding from the body portion along a fixing direction and at least one locking element formed on the body portion, wherein the at least one locking element protrudes from the body portion along the fixing direction and reaches into the at least one locking cavity, wherein in a preassembled state of the fixing element, the fixing element is preassembled on the housing of the port prior to placing the catheter on the corresponding connector of the port, wherein the at least one locking element is in positive-locking engagement with a first counter-locking element formed on the housing to hold the fixing element on the housing in the pre-assembled state, wherein in an assembled state of the fixing element the at least one locking element is in positive-locking engagement with a second counter-locking element formed on the housing to fix the fixing element with respect to the housing in the assembled state, and wherein the fixing element is movable with respect to the housing along the fixing direction for transferring the fixing element from the pre-assembled state into the assembled state, the clamping element comprises a clamping opening extending along the fixing direction, wherein the shaft portion at least in the assembled state of the fixing element reaches into the clamping opening, and the clamping element comprises a shoulder portion formed within the clamping opening, wherein in the assembled state of the fixing element the clamping element is configured to act onto the catheter by means of the shoulder portion to fix the catheter on the shaft portion of the connector.