1st Regiment of Horse or 1st Horse may refer to:
- Royal Horse Guards, ranked as 1st Horse from 1661 to 1746
- 4th Royal Irish Dragoon Guards, ranked as 1st (Irish) Horse from 1746 to 1788
- 1st Horse (Skinner's Horse)
This disambiguation page lists articles about military units and formations which are associated with the same title.
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