Members of the seven opposition political parties are singing and chanting one song calling for President Jacob Zuma to resign.
Parties include Democratic Alliance (DA), Economic Freedom Fighters (EFF), Congress of the People (Cope), United Democratic Movement (UDM) and African Independent Congress (AIC).
Marchers gathered at Church Square in Pretoria before making their way to the Union Buildings.
EFF leader Julius Malema urged his supporters to remain disciplined while marching with fellow political parties to call for the President to step down.
Thousands of South Africans also marched against President Jacob Zuma in Durban, Pretoria and Cape Town.
Listen to EWN's Barry Bateman below for more details on the march...