ConsenSys is a blockchain software company founded in 2014 by Ethereum co-founder Joseph Lubin. Based in Brooklyn, New York, the company specializes in developing infrastructure and decentralized applications (dApps) for the Ethereum blockchain. ConsenSys has been instrumental in creating some of the most widely used Ethereum applications, including the MetaMask wallet, the uPort identity tool, the Gnosis prediction market, and Infura, a service that provides scalable infrastructure for Ethereum applications.

The company operates through several branches: ConsenSys Labs, an accelerator and venture arm supporting early-stage blockchain projects; ConsenSys Academy, offering online courses for blockchain development; ConsenSys Solutions, collaborating with businesses to build blockchain-based solutions; and ConsenSys Diligence, providing security, legal, and technical guidance to protect the Ethereum ecosystem. In 2017, ConsenSys launched ConsenSys Labs, a $50 million blockchain venture fund aimed at supporting founders in the space by providing capital and networking opportunities. The company has also partnered with Microsoft to build dApps in Microsoft's Visual Studio programming platform and with Hyperledger to launch Codefi, a suite for decentralized finance solutions.

In August 2020, ConsenSys acquired Quorum®, an enterprise variant of the Ethereum blockchain developed by J.P. Morgan, enhancing its enterprise blockchain offerings. In February 2023, ConsenSys acquired Hal, a platform that provides blockchain notifications, to strengthen its Web3 development capabilities.