According to our friends at

CBD Oil which contains CBD as main ingredient is extracted from Hemp Plants with a concentration of THC lower than 0,2 %.

The following list is a list of countries that we know does allow CBD Oil from Hemp:

United StatesArgentinaAustriaBelgiumBelizeBrazilBulgariaCanadaChileChinaColombiaCosta RicaCroatiaCyprusCzech RepublicDenmarkEnglandEstoniaFinlandFranceGeorgiaGermanyGreeceGuamGuatemalaHong KongHungaryIcelandIndiaIrelandItalyLatviaLithuaniaLuxembourgMaltaNetherlandsNetherlands AntillesNorthern Ireland, NorwayParaguayPeruPolandPortugalPuerto RicoRomaniaRussiaScotlandSlovak RepublicSloveniaSouth AfricaSwedenSwitzerlandU.S. Virgin IslandsUnited KingdomUruguay, & Wales.

If you do not live in one of these countries, CBD Oil extracted from a Cannabis Sativa Variety with a THC content less then 0,2% (Hemp) may be not illegal. But  you should inform yourself about the law in your country before ordering.