South African Institute for Maritime Research (SAIMR or SAIMAR) is the name of a paramilitary organization that is believed to have performed clandestine operations to support white supremacy in Africa.

SAIMR first became publicly known during sessions of the South African Truth and Reconciliation Committee (TRC) in August 1998. A year before the second elections after the end of Apartheid, documents emerged implying SAIMR had a role in a plot to kill Dag Hammarskjöld, the UN Secretary-General, in 1961.

Letters with SAIMR’s official letterhead were found during the TRC hearings. The letters suggested that MI6 and the CIA had agreed that Hammarskjöld should be removed, a suggestion both organizations denied. Testimony from an alleged ex-SAIMR operative that SAIMR deliberately spread HIV among black people in Africa.