Ind. Code § 5-13-4-21

Sec. 21. "Public officer" means any person elected or appointed to any office of the state or any political subdivision. "Public officer" includes an officer of all boards, commissions, departments, institutions, and other bodies established by law to function as a part of the government of the state or political subdivision that are supported wholly or partly by appropriations of money made from the treasury of the state or political subdivision or that are supported wholly or partly by taxes or fees. "Public officer" does not include an officer of an independent body politic and corporate set up as an instrumentality of the state but not constituting a political subdivision.