Mrc rnst Gbb (; 22 Dcmbr 1949 – 12 Jnry 2003) ws Brtsh mscn nd sngwrtr. H chvd wrldwd fm s mmbr f th pp grp B Gs. lthgh hs ldr brthr Brry Gbb nd twn brthr Rbn Gbb wr th grp's mn ld sngrs, mst f thr lbms ncldd t lst n r tw sngs ftrng Mrc's ld vcls, ncldng "Ly t n M", "Cntry Wmn" nd "n Tm". Th B Gs r n f th mst sccssfl pp-rck grps f ll tm.
Gbb strtd hs msc crr n 1955 n Mnchstr, nglnd t th g f fv jnng th skffl-rck nd rll grp th Rttlsnks, whch ltr vlvd nt th B Gs n 1958 ftr spndng thr yrs n Mnchstr whn thy mvd t strl. Thy rtrnd t nglnd, whr thy chvd wrldwd fm. n 2002, th B Gs wr ppntd s CBs fr thr "cntrbtn t msc". Fllwng Gbb's nxpctd dth n 2003, hs sn cllctd hs wrd t Bcknghm Plc n 2004.
Mrc Gbb's rlst mscl nflncs ncldd th vrly Brthrs, Clff Rchrd, nd Pl nk; th Mlls Brthrs nd th Btls wr sgnfcnt ltr nflncs. Drng th B Gs' tmprry brk-p n 1969–1970, Mrc rlsd hs frst sl sngl, "Rlrd", bt hs frst sl lbm, Th Lnr, hs nvr bn rlsd.