SLH may refer to:
Siu Lam Hospital, a hospital in Tuen Mun, Hong Kong Small Luxury Hotels of the World, partners of Hilton Worldwide SLH Transport, Kingston, Ontario, Canada Southern Lushootseed dialect (ISO 639-3: slh) Stockton-Lindquist House, DeLand, Florida, US
Mathematics
SLH-DSA, the Stateless Hash-Based Digital Signature Standard for post-quantum cryptography
Transportation Cheboygan County Airport, Michigan, US, FAA code PNR South Long Haul rail system, Philippines Vanua Lava Airport, Vanuatu, IATA code