WTHI-FM (99.9 MHz; "HI-99") is a radio station running a country music format in Terre Haute, Indiana.

The station's studios and broadcast tower are located along Ohio Street in downtown Terre Haute.

[2] WTHI-FM has led the Terre Haute market ratings for over twenty years.

Over the years, WTHI has raised more than $1,000,000 for the kids at St. Jude Children's Research Hospital.

[4] WTHI-FM and WWVR, which were later joined by new acquisitions WFNF and WFNB, moved into their new office building in August 2012;[3] this separated the stations from WTHI-TV,[4] which moved to its own new building (at 800 Ohio Street) in October 2012.