The National Party (NP) registered a landslide victory in a two-horse-race by-election in Randburg, Johannesburg. The NP candidate amassed 10,882 votes to 1,969 for the right-wing Conservative Party (CP) candidate. The vacancy was created by Wynand Malan's retirement from politics. He won the seat in the 1989 elections for the Democratic Party (DP). The DP did not contest the 1990 by-election.