Bip or BIP may refer to:
Bipolar disorder, also known as manic depression, is a mental disorder that causes periods of depression and periods of elevated mood.
A bipolar junction transistor (bipolar transistor or BJT) is a type of transistor that uses both electron and hole charge carriers.
Bipedalism is a form of terrestrial locomotion where an organism moves by means of its two rear limbs or legs.
Bipolar II disorder (BP-II; pronounced "type two bipolar" or "bipolar type two"" disorder) is a bipolar spectrum disorder (see also Bipolar disorder) characterized by at least one episode of hypomania and at least one episode of major depression.
Biphasic sleep (or bimodal or bifurcated sleep) is the practice of sleeping during two periods over 24 hours, while polyphasic sleep refers to sleeping multiple times - usually more than two.
Bipasha Basu (born 7 January 1979), also known by her married name Bipasha Basu Singh Grover, is an Indian film actress and model.
The Bipartisan Policy Center (BPC) is a non-profit organization that "drives principled solutions through rigorous analysis, reasoned negotiation, and respectful dialogue".
Bipolar I disorder (BP-I; pronounced "type one bipolar disorder") is a bipolar spectrum disorder characterized by the occurrence of at least one manic or mixed episode.