NS21, NS 21, NS-21, NS.21, or variation, may refer to:
NS21
), Newton, Singapore; a mass transit stationNS21
), Inagawa, Hyōgo, Japan; a train stationNS21, NS 21, NS-21, NS.21, or variation, may refer to:
NS21
), Newton, Singapore; a mass transit stationNS21
), Inagawa, Hyōgo, Japan; a train station