John Duane Hattig (born February 27, 1980) is an American former professional baseball third baseman who appeared in 13 games for the Toronto Blue Jays during the 2006 season.

In the minor leagues, Hattig played in 836 games over 10 seasons, and posted a career .286 batting average.

He was selected by the Boston Red Sox in the 25th round of the 1998 Major League Baseball draft.

[2] He became the first player from Guam to play in Major League Baseball on August 19, 2006, in a game against the Baltimore Orioles.

A free agent after the 2007 season, Hattig signed a minor league contract with the New York Mets, but was released before playing a game with them.