GBL may refer to: Sports Golden Baseball League, a defunct North American league Greater Boston League, a defunct high school athletic conference in Massachusetts, United States Greater Brisbane League, a baseball league in Queensland, Australia Greek Basket League, in Greece Companies GAMCO Investors, an American financial services company GB Airways, a defunct British airline Georgian Bay Line, a defunct American steamship operator Groupe Bruxelles Lambert, a Belgian holding company Other uses Gainsborough Lea Road railway station, in England Game Based Learning Game Boy Light, a Japan-exclusive Nintendo handheld Gamit language gamma-Butyrolactone Garden-based learning Glenn A. Black Laboratory of Archaeology, at Indiana University See also GB1 (disambiguation) (disambiguation) GBI (disambiguation)