Mario Ignacio Regueiro Pintos (born 14 September 1978) is a Uruguayan retired footballer who played mainly as a left winger but also on the other flank, and even as a forward.

[2] During his professional career he played mainly in Spain, amassing La Liga totals of 167 matches and 25 goals over the course of eight seasons.

[3] In late June 2005, Regueiro signed with fellow La Liga club Valencia CF, arriving on a free transfer.

[4] With the Che, he was mainly used as a replacement, and also lost the vast majority of his second season due to a severe knee injury;[5] after the campaign was over, he also acquired Spanish nationality.

[7] Regueiro made 29 appearances for Uruguay,[8] his debut coming on 8 October 2000 in a 2002 FIFA World Cup qualifier against Argentina, a 1–2 away loss.