Operation Hardtack can refer to:
- Operation Hardtack (commando raid), a Second World War British commando raid
- Operation Hardtack I, a series of nuclear weapon test carried out in the Pacific during 1958.
- Operation Hardtack II, a series of nuclear weapon tests carried out at the Nevada Test Site during 1958.
This disambiguation page lists articles associated with the title Operation Hardtack.
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