Mike Fontenot, American baseball player
Michael Eugene Fontenot Jr. (; born June 9, 1980) is an American former professional baseball infielder who played in Major League Baseball (MLB) for the Chicago Cubs, San Francisco Giants, and Philadelphia Phillies. He batted left-handed and threw right-handed. Fontenot was commonly used at second base, shortstop, or third base during his career. He won a World Series with the Giants in 2010.

Fontenot grew up in Louisiana. He attended Louisiana State University (LSU) and was a member of the LSU Tigers team that won the 2000 College World Series. After two years of college baseball, he was a first round draft pick of the Baltimore Orioles in 2002. Named the organization's Minor League Player of the Year in 2003, Fontenot never played in the major leagues for Baltimore, as he was included in a 2005 trade with the Cubs that sent Sammy Sosa to Baltimore. Fontenot debuted briefly with the Cubs in 2005, but it was not until 2007 that he reached the major leagues full time. He batted .305 while primarily used as a bench player in 2008 and began 2009 as the Cubs' starting second baseman. However, Fontenot lost the role after batting only .230 through August 7. He was traded to the Giants in 2010, becoming part of the team's first World Series victory since 1954.

In 2011, Fontenot was receiving starting time in May due to an injury to Pablo Sandoval, but he missed a few weeks himself with a left groin injury. He was released by the Giants before the 2012 season but was signed by the Phillies. Joining the team in May, he batted .289 in 47 games before getting released in August. He spent 2013 and 2014 with the Durham Bulls, the Triple-A affiliate of the Tampa Bay Rays.