Lyle Stefan Overbay (born January 28, 1977 in Centralia, Washington) is a Major League Baseball first baseman who currently plays for the Toronto Blue Jays. He previously played baseball for the University of Nevada, Reno.

Overbay was selected by the Arizona Diamondbacks in the 18th round of the 1999 MLB draft. While playing in the farm system, he was named Diamondbacks minor league player of the year. He was briefly called up in 2001, but played mostly in AA and AAA until 2003.

Overbay first played with the Diamondbacks as the full-time first baseman in 2003. He struggled, batting .276 with 28 RBI and 4 home runs. He was sent down to AAA Tucson in June, but was called up in September to be part of the 40-man roster expansion. He was traded to the Milwaukee Brewers during the off-season.