NSBM may refer to: National School of Business Management, a Sri Lankan tertiary institute National Socialist black metal, a political philosophy within black metal music that promotes Nazism or similar ideologies Nederlandse Stoomboot Maatschappij, a Dutch shipping line later absorbed into Nedlloyd as the Koninklijk Nederlandse Stoomboot Maatschappij (KNSM) No sex before marriage Northeast School of Botanical Medicine, located in Ithaca, New York