The purpose of this article is to determine the existence of the Day-of-the-Week (DOW) effect in six Latin American stock markets: Brazil, Chile, Colombia, Mexico, Argentina, and Peru. For this, an analysis of their associated stock indexes is in order, using returns in domestic currency. Considering the years 1993-2007, each stock market shows at least one abnormal day. The most common effects for these markets were the negative return effect on Mondays and the positive return effect on Fridays.