This book constitutes the refereed proceedings of the Third International Conference on Blockchain Technology and Emerging Applications, BlockTEA 2023, held in December 2-3, 2023 in Wuhan, China. The 10 regular papers presented were carefully reviewed and selected from 41 submissions. Blockchain technology has been emerging as a potential technology to be applied in various domains, including finance, computer science, electronic engineering, agriculture, healthcare and more. The blockchain-based applications are able to aid the current systems and networks by leveraging the benefits provided by blockchain technology, such as a decentralized, immutable, and cryptographically secured ledger.