Michael "Big Mike" A. Fesi, Sr. (born May 20, 1959) is an American politician and businessman from the state of Louisiana. A Republican, Fesi has represented the 20th district in the Louisiana State Senate since 2020.
Prior to serving in elected office, Fesi worked as an oil and gas businessman, founding Pipeline Construction and Maintenance Inc. in 1996. Fesi continues to serve as the company's president, and additionally owns Kid Energy USA.
In 2015, Fesi ran for State Senate against incumbent Republican Norby Chabert, but lost to Chabert in the first round of voting with 43% of the vote. With Chabert term-limited in 2019, Fesi ran for the same seat once again, this time defeating four other candidates with 54% of the vote.