A knowledge engine generally refers to a tool for automatically extracting and structuring knowledge from unstructured sources, often with a way to search it.

Knowledge engine or Knowledge Engine may also refer to:

WolframAlpha, a website and service often described as a computational knowledge engine or answer engine Knowledge Engine (search engine), a former search engine concept developed by the Wikimedia Foundation The mind itself is sometimes referred to as a knowledge engine

See also Knowledge Graph (disambiguation), graph-based datastores, often used to by search engines to enhance search results with semantic interconnections Knowledge organization, a field of study related to library and information science Semantic networks