Enables the transfer of galactose from one side of a membrane to the other. D-galactose is widely distributed in combined form in plants, animals and microorganisms as a constituent of oligo- and polysaccharides; it also occurs in galactolipids and as its glucoside in lactose and melibiose. [ GOC:ai GOC:mtg_transport https://www.worldcat.org/search?q=bn%3A0815340729 ]