NB may refer to:
The National Broadcasting Company (NBC) is an American English language commercial broadcast television network that is a flagship property of NBCUniversal, a subsidiary of Comcast.
NBCSN is an American digital cable and satellite television channel that is owned by the NBC Sports Group division of NBCUniversal.
NBC News is a division of the American broadcast network NBC. The division operates under NBCUniversal News Group, a subsidiary of NBCUniversal, in turn a subsidiary of Comcast.
NBCUniversal (colloquially referred to as NBCU or NBCUni and formerly written as NBC Universal) is an American multinational media conglomerate.