The 1998–99 Divizia C was the 43rd season of Liga III, the third tier of the Romanian football league system.
Fortyogó Târgu Secuiesc took the place of Foresta II Fălticeni.
Hidroconcas Buzău ceded its place to Acvaterm Râmnicu Sărat.
Rafinăria Sterom Câmpina took the place of Victoria 96 Florești.
Mine-Ral Rovinari ceded its place to Pandurii Târgu Jiu.