Ustad Abdul Rab Rasul Sayyaf ( , born 1946, Paghman Valley, Afghanistan) is an Afghan Islamist politician. He took part in the war against the PDPA government in the 1980s, leading the Mujahedin faction Islamic Union for the Liberation of Afghanistan. During the war, he received patronage from Arab sources and mobilized Arab volunteers for the Mujahedin forces. Sayyaf is said to have been the one who first invited Osama bin Laden to Afghanistan, after bin Laden's 1996 expulsion from Sudan by the otherwise sympathetic Sudanese régime under Saudi, Egyptian, and American pressure.