The IKS Hor'Cha was a Klingon Imperial Defense Force starship in service in the 24th century.

At a replica of Starfleet Headquarters created by Species 8472 as a training facility for infiltration of the Alpha Quadrant, a re-ceation of Starfleet Commander Valerie Archer spoke of her assignment to the Hor'Cha as first officer in early 2375. (VOY episode: "In the Flesh")

Since the 8472 had succeeded in observing events on Earth to create their Terrasphere replicas, it can be assumed Archer's assignment to the Hor'Cha was an actual fact they included in their scenario, although this has not been specifically cited.
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