A capacitive level sensor (10) for measuring the level of a medium (14) in a container (12) is provided having a probe (16) for immersion into the medium (14) that has at least one measurement electrode (26) for a capacitance measurement and having a measurement and evaluation unit (20) that is configured to determine a capacitance at the measurement electrode (26) and to calculate a level from it. In this respect, the probe (16) has at least one reference electrode (28) for a capacitance measurement independent of the level to thus compensate environmental influences on the capacitance measurement at the measurement electrode (26).