Roelof Petrus Meyer GCOB (born 16 July 1947) is a South African politician and businessman. A Member of Parliament between 1979 and 1997, he was the chief negotiator for the National Party government during the negotiations to end apartheid. He later co-founded the United Democratic Movement.

During his time in Parliament, Meyer served in the governments of three successive presidents: P. W. Botha, F. W. de Klerk, and Nelson Mandela. After resigning from the National Party in 1997, he co-founded the United Democratic Movement with Bantu Holomisa. He returned briefly to Parliament between 1999 and 2000 before retiring from frontline politics in January 2000.

Meyer, the youngest son of Eastern Cape farmer, Hudson Meyer and school teacher Hannah Meyer, née van Heerden, attended school in Ficksburg and studied law at the University of the Free State, where he completed B Comm (1968) and LLB (1971) degrees. At university, ahe was president of the conservative "Afrikaanse Studentebond". During his compulsory military service, he was a member of the SADF choir also known as the "Kanaries". Meyer then practised as a lawyer in Pretoria and Johannesburg until 1980.

In 1979, he entered politics as he was elected as a Member of Parliament for the National Party in the Johannesburg West constituency. In 1986, he became Deputy Minister of Law and Order, an important position in P. W. Botha's government: with the declaration of the first State of Emergency in 1985, the National Joint Management Centre (NJMC), chaired by the Deputy Minister of Law and Order, took over as the nerve centre for co-ordination of all welfare and security policies. In 1988, Meyer was appointed as Deputy Minister of Constitutional Development.

In 1991, State President F. W. De Klerk appointed him Minister of Defence as successor to Magnus Malan. Allegedly, the "verligte Nat" ("liberal" or "enlightened" NP politician) couldn't win the respect of the generals in this position. In May 1992, after nine months in office, he resigned and became Minister of Constitutional Affairs and Communication as successor to Gerrit Viljoen. It was in this position that he entered the negotiating process. He also became the chairman of the Beleidsgroep vir Hervorming (Policy Group for Reform).

Meyer became famous in his position as the government's chief negotiator in the Multiparty Negotiating Forum 1993 after the failure of CODESA where he established an amicable and effective relationship with the ANC’s chief negotiator, Cyril Ramaphosa. In this role, he worked closely with Niel Barnard, who was head of the National Intelligence Service and a strong supporter of a negotiated settlement. After the conclusion of the negotiations in November 1993, he became the government's chief representative in the Transitional Executive Council (TEC). Meyer and Ramaphosa received the South African Breweries Leadership and Service Award in 2004.

In South Africa's first post-apartheid elections in April 1994, Meyer was elected to the new National Assembly, and President Nelson Mandela appointed him as Minister of Constitutional Development and Provincial Affairs in the multi-party Government of National Unity. His elder brother Tobie Meyer was Deputy Minister of Agriculture and Land Affairs in the same government. As minister, Meyer worked once again with Cyril Ramaphosa, who was chairperson of the Constitutional Assembly tasked with ratifying the post-apartheid Constitution.

In February 1996, Meyer resigned from the cabinet in order to become secretary-general of the National Party. Because of his continued interest in reforming the National Party, he remained an unpopular figure among the party's right wing, at the time led informally by Hernus Kriel. Indeed, Meyer and Kriel had clashed publicly in the past.