MSB may refer to: Main Support Battalion, part of the U.S. Army logistics. Maritime Services Board, former government agency in New South Wales, Australia. Marshall Swift-Boeckh, a cost estimation services provider and subsidiary of CoreLogic. Le Mans Sarthe Basket a French basketball team. The Magic School Bus, series of children's books about science. Media Stream Broadcast, a proprietary, multicast communications protocol owned by Microsoft.
https://en.wikipedia.org/wiki/MSB