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The subject of this article appears in Call of Duty: Black Ops Cold War
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"My friend! I'm so happy you made it!"
— Greta to Bell.

Greta Keller is a German spy based in East Berlin who acts as an informant for the CIA and a character featured in Call of Duty: Black Ops Cold War.


She is first seen at a bar where "Bell" meets her. Keller tells them about her missing informant Lukas Richter and asks them to either free him or kill him. At some point, Franz Kraus managed to capture her and Bell and brought them to Anton Volkov. Depending on Bell's choices of words, Keller can be either rescued by the CIA or killed by one of the Spetsnaz operatives working with Volkov.