ISQ

ISQ may refer to:


 * ICMP source quench, a type of messages in Internet Control Message Protocol (ICMP)
 * Implant stability quotient
 * Independent Schools Queensland, an association with which Brisbane Grammar School is affiliated
 * Industrial Skills Qualification, post-secondary vocational qualification in Brunei
 * International School of Qingdao, part of the Qingdao MTI International School
 * International Studies Quarterly, a political science journal
 * International System of Quantities
 * IATA/FAA code of Schoolcraft County Airport, an airport in Michigan's Upper Peninsula