Mark I could refer to various items in the Halo universe:
- MJOLNIR Mark I - The earliest prototype battle suit produced by Project: MJOLNIR.
- HRUNTING Mark I exoskeleton - The first powered exoskeleton developed as part of Project: HRUNTING, used during the 23rd century.
- HRUNTING/YGGDRASIL Mark I ADS - A powered exoskeleton jointly produced by Project: HRUNTING and Project: YGGDRASIL.
- HRUNTING/YGGDRASIL Mark I (J) Green Machine - A variant of the standard HRUNTING/YGGDRASIL Mark I.
- Mark I prototype exoskeleton - A prototype exoskeleton, produced by the UNSC Navy during their earliest experiments into the concept.
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