Gah

Gah may refer to:
 * Gah, Iran, a village in Razavi Khorasan Province
 * Gah, Pakistan, a village in Chakwal District
 * Gāh, a period of time in Zoroastrianism
 * the ISO 639-3 code for the Alekano language, also known as Gahuku, spoken in the Eastern Highlands Province of Papua New Guinea
 * Gayndah Airport, IATA code
 * Guanine deaminase, an enzyme