The announcement was made by AICC General Secretary Janardan Dwivedi, who said party chief Sonia Gandhi has approved the move.
Son of former Chief Minister R Gundu Rao, Dinesh is a three-time MLA and has been national spokesperson of the party.
At present, Home Minister G Parmeshwar is also the PCC Chief.
There has been talk of Energy Minister D K Shiva Kumar likely to be made the PCC chief.
Chief Minister Siddaramaiah yesterday dropped 14 ministers and inducted 13 members into his Council of Ministers in a bid to give a face-lift to his three-year old government.
Assembly elections in the state are two years away.
PTI