System for locating objects using radio frequency identifiers, comprising: - at least one object unit, each attached to an object to be located by the user and having an RFID transponder; - a proximity unit to be carried by the user, having an RFID transponder and warning means (52, 54, 55); wherein the system is configured to repeatedly obtain, using signal strength RFID readings, information relating to the distance between the proximity unit and the object unit, the proximity unit being configured for, once obtaining said information regarding the distance to the object to be located, alerting the user through the warning means (52, 54, 55) about the distance to the object to be located; characterized in that the system further comprises: - a plurality of main intermediate units, each one associated with a location area and comprising an RFID reader; - a controller in communication with the main intermediate units and configured for: • upon receiving an instruction for locating a particular object, obtaining the reading from the RFID reader of each main intermediate unit; • determining, based on these readings, the location area of the object to be located; • sending information to the user about said location area of the object to be located; - a plurality of peripheral intermediate units, each one comprising an RFID transponder; and wherein the main intermediate unit associated with the location area of the object to be located is configured for: detecting the presence of the proximity unit carried by the user when said user is within the location area of the object to be located; repeatedly obtaining information relating to the distance between the proximity unit and the object unit using the captured signal strength readings coming from the RFID transponders (41, 51, 61) of the peripheral intermediate units, the proximity unit and the object unit, and sending said readings to the controller in order to calculate the distance to the object to be located and to determinate a movement suggestion; and repeatedly sending said information relating to the distance to the object to be located and movement suggestion to the proximity unit. - at least one object unit, each attached to an object to be located by the user and having an RFID transponder; - a proximity unit to be carried by the user, having an RFID transponder and warning means (52, 54, 55); wherein the system is configured to repeatedly obtain, using signal strength RFID readings, information relating to the distance between the proximity unit and the object unit, the proximity unit being configured for, once obtaining said information regarding the distance to the object to be located, alerting the user through the warning means (52, 54, 55) about the distance to the object to be located; - a plurality of main intermediate units, each one associated with a location area and comprising an RFID reader; - a controller in communication with the main intermediate units and configured for: • upon receiving an instruction for locating a particular object, obtaining the reading from the RFID reader of each main intermediate unit; • determining, based on these readings, the location area of the object to be located; • sending information to the user about said location area of the object to be located; • upon receiving an instruction for locating a particular object, obtaining the reading from the RFID reader of each main intermediate unit; • determining, based on these readings, the location area of the object to be located; • sending information to the user about said location area of the object to be located; - a plurality of peripheral intermediate units, each one comprising an RFID transponder; detecting the presence of the proximity unit carried by the user when said user is within the location area of the object to be located; repeatedly obtaining information relating to the distance between the proximity unit and the object unit using the captured signal strength readings coming from the RFID transponders (41, 51, 61) of the peripheral intermediate units, the proximity unit and the object unit, and sending said readings to the controller in order to calculate the distance to the object to be located and to determinate a movement suggestion; and repeatedly sending said information relating to the distance to the object to be located and movement suggestion to the proximity unit.