HS1, or High Speed 1, is the high-speed Channel Tunnel Rail Link running south from London to the tunnel between England and France.
HS1 or HS-1 may also refer to:
The Collaborative International Dictionary
HS1 \HS1\, HSV-1 \HSV-1\, HSV-I \HSV-I\n. 1. Herpes simplex 1, a herpes virus that causes oral herpes; also called type I Herpes.
Syn: herpes simplex 1.