Grena Corporation is an Australian bus manufacturing, and mass transit company, based in Melbourne, Victoria, Australia. Beyond its public transport operations, Grenda owns the bus body-work business Volgren. It runs a commercial charter coach company, a tour company, and operates route-bus services in the south-eastern suburbs of Melbourne, under contract from the state government, under a variety of brand names. In association with the Hornibrook Group's Hornibrook Bus Lines, it owns a share of Australian Transit Enterprises, which operates transit services under contract in Perth and Adelaide.