Taq or TAQ may refer to:
Taq, Iran, a village in Semnan Province Taq, a medieval fortress in the historical region of Sistan, possibly the ruins at Shahr-i Gholghola in present-day Afghanistan TAQ (role-playing game), published 1991 Taq polymerase, a heat-stable enzyme used in polymerase chain reaction Thermus aquaticus, the species of bacteria from which the polymerase is naturally derived Terminus ante quem, the latest possible date for a specific event Trade and Quote (TAQ), a form of high frequency data used by stock exchanges