Thomas Hennessy (born June 11, 1994) is an American football long snapper for the New York Jets of the National Football League (NFL). He played college football at Duke. He has also been a member of the Indianapolis Colts.

Hennessy played high school football at Don Bosco Preparatory High School in Ramsey, New Jersey, where he was a three-year letterman. He helped the team to a three-year record of 35–0. The school also won three state championships and were named national champions by USA Today in 2009 and 2011.^[1] In the class of 2012, he was rated the ninth best long snapper in the country by Kohl's.^[1][2]

Hennessy played for the Duke Blue Devils of Duke University from 2013 to 2016. He was redshirted in 2012. He started all 14 games in 2013 and played 149 total snaps.^[1] Hennessy also recorded one solo tackle.^[3] He started all 13 games in 2014 and played 133 total snaps.^[1] He also recorded one solo tackle and one tackle assist.^[4] Hennessy started all 13 games in 2015 and played 144 total snaps. He started all 12 games in 2016 and played 119 total snaps.^[1][5] He also recorded one solo tackle.^[5] He played in 52 games, all starts, during his college career and played 545 total snaps.^[1] He also recorded three solo tackles and one tackle assist.^[3][4][5] Hennessy majored in biology and minored in psychology at Duke.^[1]

Thomas Hennessy grew up in Bardonia, New York. His brother, Matthew Hennessy, plays center for the Atlanta Falcons. Thomas and his brother grew up as New York Giants fans.^[12] In 2019, he married former Duke volleyball player, Christina Vucich Hennessy.