B2G

B2G may refer to:
 * B2G OS, community-developed successor to Firefox OS
 * Battery-to-grid, specifically vehicle-to-grid
 * Be2gether, a music and arts festival held in Lithuania
 * Boot to Gecko, the codename for Firefox OS, a mobile operating system proposed by Mozilla and built upon its Gecko layout engine
 * Bridge to Grace, an American rock band from Atlanta, Georgia
 * Business-to-government
 * Great Lakes B2G, a US Navy carrier-borne bomber