Operation Grand Slam was a military operational plan used by the Pakistan Army during the Indo-Pakistani War of 1965.
Operation Grand Slam may also refer to:
- A fictional scheme featured in:
- the code name for U.S. espionage mission 4154 over the Soviet Union that led to the 1960 U-2 incident
- Operation Grandslam, the United Nations-led military offensive operation launched in December 1962 during the Congo Crisis