IS1

IS1, IS-1, or variation, may refer to:

IS1
IS1 may refer to:
 * HMG Infosec Standard No.1, a computer security standard used in the UK
 * The IBM IS1, an early relational database system

IS-1
IS-1 may stand for:
 * The Soviet tank IS-1 the first model of the Soviet Iosif Stalin tank series
 * The first model of the Soviet Istrebitel Sputnikov missile; see anti-satellite weapon
 * Nikitin IS-1, a retractable wing fighter aircraft