Operation Trident (Englean Kaiserreich)
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{{Infobox nuclear weapons test
|name = Operation Trident
|picture = Blue Danube Bomb.jpg
|picture_description = Type 1955(B) "Atomwaffe 2" bomb, similar to that used in the tests.
|country = 
Englean Kaiserreich
|test_site = Imperial Test Site Heimarch, Heimarch Archipelago
|date = 15 September 1959
|number_of_tests = 3
|test_type = air-drop, balloon
|max_yield = 27 kilotonnes of TNT (110 TJ)
|previous_series = Operation Flying Fish
|next_series = Operation Siegfried
Operation Trident (Unternehmen Trident) was a series of nuclear tests conducted by the Englean Kaiserreich, beginning on 15 September 1959. These tests were designed to test components for the first Englean thermonuclear weapon, which was expected to be completed by 1963.