Pieter Willem Adriaan Mulder (born 26 July 1951) is a South African politician and the former leader of the Freedom Front Plus.

He completed his secondary education at Riebeeck High School in Randfontein, where he was head boy and Victor Ludorum in athletics.

He represented the town of Potchefstroom in Parliament for nearly thirty years from 1988–2017, initially elected as an MP for the Conservative Party (KP).

[5][6] In 2004, under Mulder's leadership, the Freedom Front was renamed Freedom Front Plus after absorbing the smaller Conservative Party, the Afrikaner Eenheidsbeweging (Afrikaner Unity Movement), which lost its only seat in the National Assembly due to floor-crossing, and the Federal Alliance of Dr. Louis Luyt.

[7][8] On 10 May 2009, President Jacob Zuma announced his appointment of Mulder as the Deputy Minister of Agriculture, Forestry and Fisheries.