J.P. du Toit (31 July 1981 – 13 February 1983) The 18th South African Parliament was the eighteenth Parliament of South Africa to convene since the unification of South Africa in 1910 and the sixth to convene since the adoption of the republican constitution in 1961.

It was elected in the 1981 South African general election and consisted of the unicameral House of Assembly.

The House of Assembly contained 165 members.

The National Party retained a diminished majority: it won 131 of the 165 seats, a decrease from the 134 seats it held in the 17th Parliament.

The table below gives the number of registered voters (all of whom were classified as white under the apartheid legislation) and parliamentary seats, on the day of the election, broken down by province.