PMB

PMB can stand for:

* Paleomammalian brain, part of Paul D. MacLean's Triune Brain hypothesis.
* Pembroke College, Oxford
* Phenylmagnesium bromide, a Grignard reagent used in chemical reactions
* PMB ether, a hydroxyl protecting group for multi-step organic synthesis, Paramethoxybenzyl
* Pietermaritzburg, a South African city
* PMB, An open-source web-based Integrated Library System named PhpMyBibli at its beginning
* Polymyxin B, an antibiotic
* Print Measurement Bureau, a Canadian non-profit media surveying and statistical company
* Private mailbox, a mail delivery designation for addresses associated with a commercial mail receiving agency
* Private Member's Bill, a type of Bill introduced into the United Kingdom's Parliament
* The Pat McGee Band
* The Prison Motorcycle Brotherhood, a white prison gang in Minnesota and other parts of the upper Midwest in the USA.