MPB
MPB can refer to:

Male pattern baldness
Mountain pine beetle, a barkbeetle in the US and Canada

Health and science
Morphotropic phase boundary, a zone e.g. in PZT ceramics

Companies and agencies
Mississippi Public Broadcasting, US
Maritime and Port Bureau, Taiwan
MP Birla Group, India

Arts and culture
Monthly Playboy, Japanese edition
Música popular brasileira, Brazilian popular music
MPB4, a Brazilian musical group