OPB may refer to: Obscene Publications Branch, a former unit of the Metropolitan Police in London, England Oregon Public Broadcasting, a radio and television network based in the U.S. state of Oregon Oregon Progress Board, a commission of the Oregon state government Xilinx On-chip Peripheral Bus, a low-speed bus for connecting peripherals within a Xilinx system on a chip In music, sometimes used as an abbreviation for "originally performed by" Oakridge Project Bloods, a Bloods gang in Oak Ridge, Tennessee.