Yahalom (meaning "diamond" in Hebrew) may refer to:
- Yahalom (IDF), the elite combat engineering unit of the Israel Defense Forces Engineering Corps
 - Yahalom (protocol), networking security protocol used to authenticate and interchange symmetric keys over a non-trusted network like the Internet.
 - Operation Diamond, or Mivtza' Yahalom, an operation undertaken by Mossad
 - Yahalom (surname)
 
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