1Q

1Q may refer to:


 * First quarter of a calendar year
 * Sirena (airline) (IATA code)
 * 1q, an arm of Chromosome 1 (human)
 * SSH 1Q (WA); see Washington State Route 505
 * AH-1Q, a model of Bell AH-1 Cobra
 * P4M-1Q, a model of Martin P4M Mercator
 * A3D-1Q, a model of Douglas A-3 Skywarrior
 * AD-1Q, a model of Douglas A-1 Skyraider