Operation Quicksilver can refer to at least 3 military operations:

• Operation Quicksilver (WWII) was a WWII plan by the Allies that was a sub-plan of Operation Fortitude
• Operation Quicksilver (1978) was a American nuclear test series of eighteen blasts conducted at the Nevada Test Site in 1978 and 1979.
• Operation Quicksilver (1990s) was a plan to reduce the size of the United States Army in the early 1990s as a result of the end of the Cold War.