SLH may refer to:
- Cheboygan County Airport, Michigan, US, FAA code
- Small Luxury Hotels of the World, partners of Hilton_Worldwide
- SLH Transport, Kingston, Ontario, Canada
- Stockton-Lindquist House, DeLand, Florida, US
- Lemniscate elliptic functions § Hyperbolic lemniscate functions
- Vanua Lava Airport, Vanuatu, IATA code
- SLH-DSA, the Stateless Hash-Based Digital Signature Standard for post-quantum cryptography
