Adapters for refilling an aerosol delivery device are provided. The adapters comprise a body having a container-side end and an opposing, device-side end that are sealably connectable with respectively a container of aerosol precursor composition and an aerosol delivery device having a refillable reservoir. The body defines a passageway between the ends for transfer of aerosol precursor composition from the container into the refillable reservoir. In one adapter, the container-side end is configured to engage a valve of the container during refilling of the reservoir, and thereby defines separate and distinct filling and mating ports. In another adapter, the device- side end includes a valve configured to engage the aerosol delivery device during refilling of the reservoir in which the airflow port of the aerosol delivery device is closed by the valve to prevent the aerosol precursor composition from passing through the airflow port.