The R577 is a Regional Route in South Africa that connects Roossenekal with Lydenburg.
Its western terminus is a junction with the R555 at Roossenekal, Limpopo. It heads east, becoming the Jaap-se-Hoogte Pass, then becoming the De Berg Pass through the Steenkampsberg mountains, to end at an intersection with the R540 south of Mashishing (Lydenburg), Mpumalanga.