NB or Nb may refer to:
The National Broadcasting Company (NBC) is an American English-language commercial terrestrial television network that is a flagship property of NBCUniversal, a subsidiary of Comcast.
NBCSN is an American pay television channel that is owned by the NBC Sports Group division of NBCUniversal.
NBC News is the news division of the American broadcast television network NBC. The division operates under NBCUniversal Broadcast, Cable, Sports and News, a subsidiary of NBCUniversal, in turn a subsidiary of Comcast.
NBC Sports is the programming division of the American broadcast network NBC, owned by the NBCUniversal Television Group division of NBCUniversal, that is responsible for sports broadcasts on the network, and its dedicated national sports cable channels.