Ruk

Ruk or RUK may refer to:
 * Ruk (area), measuring land in acres and valuing it
 * Rük, a village in Azerbaijan
 * Reserve Officer School (Reserviupseerikoulu, RUK), in Finland
 * rUK (rest of the UK), countries of the United Kingdom excluding Scotland
 * Ruk, an android character in the Star Trek episode "What Are Little Girls Made Of?"