Ronaldo de Assis Moreira (an haife shi a ranar 21 ga watan Maris shekarar 1980), anfi saninsa da Ronaldinho ko Ronaldinho Gaúcho, "Ronaldinho", shine sunan "Ronaldo" idan aka tsawaita ta, kuma ana kiransa da "Gaúcho" (tun tasowarsa daga southern Brazil), saboda ya banbanta daga abokin wasansa kuma dan kasarsa wato Ronaldo, wanda an sansa da "Ronaldinho" a Brazil kafin nan. Ronaldo sai ya fara amfani da sunansa na farko bayan komawarsa Turai, hakan yaba Ronaldinho daman ajiye sunan "Gaúcho" yafara amfani da sunan Ronaldinho a kasashen waje. dan'wasan yana daga cikin kwararrun yan kwallon kafa na kasar Brazil kuma shine ambassador a Barcelona. ya buga wasanni a matsayin dan'wasan tsakiya attacking midfielder, amma kuma ya buga forward ko gefe winger. Ya buga kaso mai yawa na rayuwar ƙwallon ƙafar sa a Turai, ma ƙungiyoyin Paris Saint-Germain, Barcelona da A.C. Milan da kuma buga ma kasar sa Brazilian national team.