Mark Messmer

Mark Messmer
Official House portrait of Messmer smiling in front of the U.S. flag, wearing a dark blue suit, dotted white and blue shirt, and floral green and dark blue tie.
Official portrait, 2024
Member of the U.S. House of Representatives
from Indiana's 8th district
Assumed office
January 3, 2025
Preceded byLarry Bucshon
Majority Leader of the Indiana Senate
In office
November 7, 2018 – August 17, 2022
Preceded byRodric Bray
Succeeded byChris Garten
Member of the Indiana Senate
from the 48th district
In office
November 5, 2014 – September 3, 2024
Preceded byLindel Hume
Succeeded byDaryl Schmitt
Member of the Indiana House of Representatives
from the 63rd district
In office
November 5, 2008 – November 5, 2014
Preceded byDave Crooks
Succeeded byMike Braun
Personal details
BornMark Brian Messmer
(1962-09-21) September 21, 1962
PartyRepublican
SpouseKim Messmer
Children4
EducationPurdue University (BS)
WebsiteHouse website
Campaign website

Mark Brian Messmer (born September 21, 1962) is an American politician who has served as the U.S. representative for Indiana's 8th congressional district since 2025. He is a member of the Republican Party.

Previously, Messmer served in the Indiana House of Representatives from 2008 to 2014 and the Indiana Senate from 2014 to 2024, serving as majority leader of the chamber from 2018 to 2022. Before that, he previously served on the Holy Family School Board from 2001 to 2004, and as its president from 2003 to 2004.

Representing a safe Republican district, Messmer was first elected to Congress in 2024 after winning a crowded Republican primary with 38% of the vote. He is a member of the moderate Republican Governance Group.