IronKey is the brand name of a family of encrypted USB portable storage devices owned by Kingston Digital, the flash memory affiliate of Kingston Technology Company, Inc.
From 2005 to 2012, IronKey was an Internet security and privacy company based in California. IronKey's founding was partially funded by the U.S. federal government, with a grant of US$1.4 million through the Homeland Security Research Projects Agency. Their products have been used by the U.S. government in various areas.
Imation acquired IronKey in September 2011. In October 2012, IronKey rebranded itself as Marble Security, and the IronKey brand became wholly owned by Imation. As part of Imation, the IronKey portfolio includes products and intellectual property from the former IronKey, as well as technologies from Imation acquisitions of MXI Security and ENCRYPTX.
On February 8, 2016, DataLocker Inc. announced it had acquired Ironkey's Enterprise Management Service (EMS) and other assets from Imation. 
In November 2018, Kingston announced that the IronKey had new features and was now FIPS 140-2 Level 3 certified.
In early 2021, a reported 7,000 Bitcoin were stranded in a IronKey flash drive due to a forgotten password owned by programmer Stefan Thomas which did not utilize the Enterprise Management Service for password recovery. 
Among Imation’s IronKey products are flash drives certified by Microsoft for Windows To Go. Windows To Go is an enterprise feature of Windows 8 that enables the creation of a workspace that can be booted from a USB-connected external drive on PCs that meet Microsoft certification requirements, regardless of the operating system running on the PC. A Windows To Go product, the IronKey Workspace W300, received the Editors’ Choice accolade from PC Magazine in February 2013.