Ind. Code § 4-6-5-6
(b) The term "agency", whenever used in this chapter, means and includes any board, bureau, commission, department, agency, or instrumentality of the state of Indiana; provided, however, this chapter shall not be construed to apply where:
(4) A constitutional officer of the state is by law made a board, bureau, commission, department, agency, or instrumentality of the state of Indiana.
Formerly: Acts 1943, c.70, s.6; Acts 1965, c.293, s.1. As amended by P.L.5-1984, SEC.22; P.L.136-2018, SEC.7.