IDEX can refer to several things, including:

International Defence Exhibition, a biennial arms and defense technology sales exhibition IDEX Corporation, a publicly listed company that makes fluidics systems and specialty engineered products Ideanomics, a publicly traded company that trades under the IDEX ticker symbol. Idex ASA, a Norwegian biometrics company Independent Dual Extrusion, a 3D printing technology Integrated Daily Execution, a daily meeting in organisations to deploy operational performance initiatives.