VOP, Vop or VoP may refer to:
velocity of propagation, electromagnetic signal speed Vop (river), a river in Smolensk Oblast, Russia Voice of Peace, an offshore radio station off the coast of Tel Aviv, active between 1973 and 1993. Resumed as online radio in 2009 Voice of Prophecy, a US religious media ministry led by Shawn and Jean Boonstra Virginia Organizing Project, a grassroots community-empowerment organization Radio Voice of the People, a Zimbabwean radio station Violation of Probation, non-compliance with probation terms Voice of the People (website), South Korean online newspaper Variation of parameters, a method to solve linear differential equations