Clarion may refer to:

• Clarion (instrument), a type of trumpet used in the Middle Ages
• Clarion register of clarinets, ranging from B4 to C6
• Clarion (song), a 2008 single by multinational band Guillemots

Connectionist Learning with Adaptive Rule Induction On-line (CLARION) is a cognitive architecture that has been used to simulate several tasks in cognitive psychology and social psychology, as well as implementing intelligent systems in artificial intelligence applications. An important feature of CLARION is the distinction between implicit and explicit processes and focusing on capturing the interaction between these two types of processes. The system was created by the research group led by Ron Sun.