X0101 EFFECT 33 LIVE 2013-04-30 0001193125-13-183215 485APOS 0000909504 GAMCO GLOBAL SERIES FUNDS, INC 033-66262 S000001064 The Gabelli Global Rising Income and Dividend Fund C000002862 CLASS A S000001064 The Gabelli Global Rising Income and Dividend Fund C000002864 CLASS C S000001064 The Gabelli Global Rising Income and Dividend Fund C000002865 CLASS AAA S000001064 The Gabelli Global Rising Income and Dividend Fund C000034308 CLASS I S000001065 GAMCO GLOBAL GROWTH FUND C000002866 CLASS A S000001065 GAMCO GLOBAL GROWTH FUND C000002867 CLASS AAA S000001065 GAMCO GLOBAL GROWTH FUND C000002869 CLASS C S000001065 GAMCO GLOBAL GROWTH FUND C000034309 CLASS I S000001066 GAMCO GLOBAL OPPORTUNITY FUND C000002871 CLASS C S000001066 GAMCO GLOBAL OPPORTUNITY FUND C000002872 CLASS A S000001066 GAMCO GLOBAL OPPORTUNITY FUND C000002873 CLASS AAA S000001066 GAMCO GLOBAL OPPORTUNITY FUND C000034310 CLASS I S000001067 GAMCO GLOBAL TELECOMMUNICATIONS FUND C000002874 CLASS A S000001067 GAMCO GLOBAL TELECOMMUNICATIONS FUND C000002875 CLASS AAA S000001067 GAMCO GLOBAL TELECOMMUNICATIONS FUND C000002877 CLASS C S000001067 GAMCO GLOBAL TELECOMMUNICATIONS FUND C000034311 CLASS I