The name Guildenstern may refer to:
- Guildenstern (Detinan), a fictional character based on William Rosecrans in The War Between the Provinces.
- Guildenstern (Hamlet), a minor character from William Shakespeare's Hamlet, and a title character in Tom Stoppard's Rosencrantz and Guildenstern Are Dead. The character appears in Harry Turtledove's short story "We Haven't Got There Yet".
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