SH may refer to:

• FlyMe (IATA airline designator SH), a defunct airline
• Sacred Heart Cathedral Preparatory, a school in San Francisco, California, USA
• Sacred Heart University
• Sonatrach, an Algerian oil company

• Saint Helena (ISO 3166 digram and FIPS PUB 10-4 territory code)
• Canton of Schaffhausen, Switzerland
• Schleswig-Holstein, a state of Germany
• Shanghai, China (Guobiao abbreviation SH)
• Shortstown, England
• South Horizons
• State highway

• sh (digraph), a letter combination used in some languages
  • Voiceless postalveolar fricative [ʃ], the sound usually spelt sh in English
• sh (letter), a letter of the Albanian alphabet
• sh, IETF language tag and deprecated ISO 639-1 code for Serbo-Croatian

• .sh, the country code top-level domain (ccTLD) of Saint Helena
• Lib Sh, a graphics metaprogramming library for C++
• Unix shell, a general command-line shell for Unix
• Bourne shell, a command-line shell for Unix
• Thompson shell, a command-line shell for Unix
• Sharp Corporation's mobile phones in Japan
• SuperH, a Hitachi microcontroller
• An interface type in the IP Multimedia Subsystem
• Sensor hub
• sh, Store Half, an RISC-V instruction

• -SH, representing the thiol functional group in a chemical structure diagram
• Hyperbolic sine (sh), a mathematical function
• Siberian High, in meteorology
• Sherwood number, in engineering
• Suslin hypothesis, in mathematical set theory
• Seismic Handler, a program that used in seismology

• Sacrifice hit, in baseball scoring
• Self-harm, where people intentionally hurt themselves
• Sheikh, an honorific title in the Arabic language
• Silent Hill, video game franchise of survival horror
• Sherlock Holmes, a fictional detective created by Arthur Conan Doyle
• HS or SH Solar Hijri calendar, the modern Iranian calendar
• An abbreviation for shilling

• Sha (Cyrillic), the letter ш, transliterated into English script as "sh"