Exhibit 23.2

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the use in this Registration Statement on Form S-4 of Investar Holding Corporation of our report dated February 7, 2017, relating to our audit of the 2016 consolidated financial statements of BOJ Bancshares, Inc. and Subsidiaries appearing in the proxy statement/prospectus, which is part of this Registration Statement.

We also consent to the reference to our firm under the captions “Experts” in such proxy statement/prospectus.

/s/ Silas Simmons LLP

Silas Simmons LLP

Natchez, Mississippi

October 10, 2017