Mark B. Messmer is a Republican member of the Indiana State Senate, representing the Senate District 48 since November 19, 2014. Messmer is a former member of the Indiana House of Representatives, representing three terms for the 63rd district from November 5, 2008, to November 4, 2014. He previously served on the Holy Family School Board from 2001 to 2004. He served as its president from 2003 to 2004. In 2022, Messmer sponsored a bill that bans the foreign ownership of agricultural land in Indiana.