DataCastle (DC Competitions) is a Chinese platform for big data and artificial intelligence competitions, operated by Chengdu DataCastle Technology Co., Ltd. Since 2013, it has served a community of more than 200,000 people in the data science field. The platform brings together developers, learners, educators, and organizations through competitions and learning resources.

Participants can take on challenges, compare results, and compete for rankings, while organizations can explore hosting their own events. DataCastle also offers DCLab, an online programming and experimentation environment, alongside datasets, project sharing, open-source resources, and online courses. Its services extend to competition operations, international event delivery, data science talent development, and artificial intelligence education for K–12 students.

Teaching competitions and classroom support are also available for educational use. The site provides guidance on entering competitions, account assistance, certificate lookup, and other user support, as well as policies covering competition conduct, privacy, payments, and discussion forums. Through these offerings, DataCastle connects practical challenges with tools and educational services for the wider data and AI community